Heating and air conditioning strip a home’s indoor air of its natural humidity. The result of uncomfortable dryness leaves skin feeling dehydrated, contributes to sinus and respiratory problems, and even promotes static electricity—that annoying shock that occurs upon crossing a carpeted room and touching the television.

A little added moisture in the air helps alleviate dust mites, reduces allergy symptoms, and soothes irritated nasal passages. In addition to a handful of household hacks, residents can rely on humidifiers to help the situation. Humidifiers have been around for decades, but today’s models offer more choices than ever before. We’ve done the legwork and found out what features buyers want most in humidifiers as well as which models they rate as the best humidifiers.

Keep reading to learn all about today’s room humidifiers, hear what experts have to say about these devices, and discover why we’ve selected these as top choices, depending on a person’s individual home and needs.

1. BEST OVERALL: Levoit Classic Ultrasonic Smart Humidifier
2. BEST BANG FOR THE BUCK: Pure Enrichment MistAire Studio Ultrasonic Humidifier
3. UPGRADE PICK: Venta Filter-Free Evaporative Humidifier
4. BEST DESIGN: Honeywell Designer Series Cool Mist Humidifier
5. BEST PORTABLE: Geniani Erie Portable Small Cool Mist Humidifier
6. QUIETEST OPERATION: Everlasting Comfort Air Humidifier for Bedroom
7. BEST FOR PLANTS: Crane 4-in-1 Drop Ultrasonic Cool Mist Humidifier
8. BEST FOR SMALL ROOMS: Raydrop Cool Mist Small Room Humidifier
9. BEST FOR LARGE ROOMS: Vornado Evap40 4-Gallon Evaporative Humidifier
10. BEST WHOLE-HOUSE: Aircare MA Console-Style Evaporative Humidifier

Product Comparison

Our Top Picks

We considered factors such as warm versus cool mist, size, and technology to determine the best room humidifier for just about any residence.

Best Overall

Levoit Classic Ultrasonic Smart Humidifier

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What We Like

• Smart controls to create schedules and monitor humidity
• 4 mist levels and auto mode
• Large water tank provides long runtimes

What We Don’t Like

• A small number of leaks have been reported

Product Specs 

• Type: Ultrasonic
• Runtime: Up to 60 hours
• Coverage: 215 to 505 square feet

With so many quality models available, it isn’t easy picking a single best room humidifier. The Levoit Classic takes top spot for its wide-ranging feature set at a price that won’t break the bank.

A 6-liter (1.6-gallon) water tank provides a runtime of up to 60 hours in rooms from 215 to 505 square feet. It has a top opening that’s easy to fill—and easy to clean, too. It includes an aromatherapy tray for oils that can add pleasant aromas to the room and can help relieve nasal congestion or a sore throat.

There are four mist levels, an auto mode that maintains the desired humidity, and a sleep mode that turns off the display. Smart control allows schedules and timers to be set, and the Levoit Classic can integrate with Amazon Alexa or Google Assistant for voice control.

Get the Levoit room humidifier at Amazon or Best Buy.

Best Bang For The Buck

Pure Enrichment MistAire Studio Ultrasonic Humidifier

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What We Like

• Compact model ideal for modest spaces at a very competitive price
• High and low mist settings provide up to 10 hours per refill
• Easy-to-fill top-loading model

What We Don’t Like

• Small tank means frequent refilling required

Product Specs 

• Type: Ultrasonic
• Runtime: Up to 10 hours
• Coverage: Up to 175 square feet

The Pure Enrichment MistAire Studio humidifier is a sleek, good-looking model that is compact enough to fit on a desk, side table, or bedside cabinet. It’s an ideal solution for those who want humidification for rooms up to 175 square feet, and it comes with a budget-friendly price tag.

There are two mist settings (high and low), providing runtimes of either 7 or 10 hours. It could, for example, be used for a bedroom (it includes a night-light), then topped up and moved to a home office, kitchen, or workroom during the day. There’s an automatic shutoff to prevent damage if it runs dry.

Get the Pure Enrichment room humidifier at Walmart or Target. 

Upgrade Pick

Venta Filter-Free Evaporative Humidifier

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What We Like

• Runs for more than a week before it needs cleaning
• Simple top-mounted LED touch controls
• Runs safely on tap water

What We Don’t Like

• More expensive than other picks on our list

Product Specs 

• Type: Cool mist
• Runtime: None provided (see above)
• Coverage: 600 square feet

This Venta humidifier uses an unusual—yet very simple—design of a disk stack running in a 3-gallon bath of water. With no wick or filters to clean or replace, it’s a very low-maintenance machine. While many standard humidifiers require cleaning every day or so, the Venta only needs to be checked every 10 to 14 days, and the process is very straightforward.

This Venta model is rated for coverage of up to 600 square feet and offers three speeds for rapid humidification if desired. The company doesn’t provide a runtime but does suggest that the water level be checked daily. Should the water run out, the machine will automatically switch itself off.

Venta says their machine naturally reduces air pollutants. Another option is to consider a combined humidifier and air purifier, devices we explored

in detail here

.

Get the Venta room humidifier at Amazon or The Home Depot.

Best Design

Honeywell Designer Series Cool Mist Humidifier

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What We Like

• Sleek, modern, filter-free design
• Ergonomic handle
• Tactile scroll wheel allows adjustment of mist output

What We Don’t Like

• At the price, we’re surprised that there’s no humidistat

Product Specs 

• Type: Cool mist
• Runtime: Up to 24 hours
• Coverage: None listed (see above)

Good design is about more than visual appeal. While we expect many will find the exterior of the Honeywell Designer Series humidifier attractive, there are several valuable ergonomic and practical elements we can recommend as well.

A clever handle in the lid gives easy access to the 1.25-gallon lift-out water tank, making it easy to fill and clean. An illuminated window lets users check the water level easily with three lighting settings: bright, dim, and off. There’s also an auto shutoff if it reaches empty. Below this is a thumbwheel that allows the mist output to be adjusted to personal preference. Honeywell claims the Designer Series humidifier can run for up to 24 hours, though rather than give a specific coverage area, the machine is simply described as for medium to large rooms.

Get the Honeywell room humidifier at Amazon or Walmart (in black).

Best Portable

Geniani Erie Portable Small Cool Mist Humidifier

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What We Like

• Compact and lightweight cordless model
• 1-button operation and USB charging
• Fits in most cup holders

What We Don’t Like

• Quality control might be hit or miss

Product Specs 

• Type: Cool mist
• Runtime: Up to 8 hours
• Coverage: Up to 65 square feet

Folks who need to humidify a variety of small spaces but only want to purchase one machine will want to take a close look at Geniani’s portable unit. It’s compact, has cordless operation, and weighs under 11 ounces. This travel-ready mini model will even fit into vehicle cup holders. USB charging can be done via a laptop, portable power pack, or household socket with an appropriate adapter.

Despite a tank that’s only 0.006 gallon, the Geniani will run for up to 8 hours. Coverage isn’t huge at 65 square feet, but it’s adequate for many modern motel rooms. It runs silently, so it won’t disturb sleep. There’s a built-in nightlight plus an auto shutdown that prevents damage if it dries out.

Get the Geniani room humidifier at Amazon or Walmart.

Quietest Operation

Everlasting Comfort Air Humidifier for Bedroom

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What We Like

• Uses “whisper-quiet” motor technology
• Straightforward dial control
• Includes night-light and drawer for aromatherapy oils

What We Don’t Like

• Awkward to carry when full without spills

Product Specs 

• Type: Ultrasonic
• Runtime: Up to 50 hours
• Coverage: Up to 500 square feet

It’s never easy to define how quiet something is because we all hear differently. However, we do know that ultrasonic humidifiers like this one from Everlasting Comfort are typically quieter than fan-based alternatives. Although the manufacturer doesn’t give an actual decibel level, independent figures put it at under 35 decibels, which is the equivalent of the “whisper quiet” given in the description.

This low sound level is all the more impressive given the performance provided. Variable mist output gives a runtime anywhere from 22 to 50 hours from the 1.6-gallon water tank, and it’s rated for coverage of 500 square feet. An aromatherapy oil tray lets users scent the room either purely for pleasure or to combat seasonal allergies.

Get the Everlasting Comfort room humidifier at Amazon or Walmart.

Best For Plants

Crane 4-in-1 Drop Ultrasonic Cool Mist Humidifier

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What We Like

• Adjustable 360-degree nozzle
• 3 speed settings to adjust output
• Choice of white noise, rain, or ocean waves to help sleep

What We Don’t Like

• Sounds or night-light aren’t for everyone (but can be turned off)

Product Specs 

• Type: Ultrasonic
• Runtime: Up to 24 hours
• Coverage: Up to 500 square feet

Those keen on houseplants probably know that most of them love increased humidity. While tropical plants may prefer a warm mist humidifier, these devices can cause discomfort for people. The Crane ultrasonic cool mist model is a solution that will keep both plant life and human occupants happy.

The 360-degree nozzle allows humidity to be directed where it’s needed most, and three speeds deliver the desired moisture level. With its clear 1-gallon tank, the Crane humidifier can run for up to 24 hours and provide coverage for up to 500 square feet. For nighttime use, it comes with a choice of three soothing sounds, and it has a night-light that changes colors. An aroma tray is included that can accept pads or oil.

Get the Crane room humidifier at Amazon, Walmart, or Target.

Best For Small Rooms

Raydrop Cool Mist Small Room Humidifier

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What We Like

• Low-cost model that’s great for small spaces
• Impressive runtime for its size
• Very quiet with an easy-to-use dial

What We Don’t Like

• Cannot use essential oils

Product Specs 

• Type: Ultrasonic
• Runtime: Up to 9 hours
• Coverage: 220 square feet

Finding a spot for a humidifier can be a challenge in small spaces like dorm rooms or campers. This Raydrop humidifier boasts a compact design that’s only 4.7 inches in diameter, so it should be easy to find a space for it in small or cluttered spaces. It also has a noise level of just 32 decibels, which is described as very faint, so it should not disturb sleepers.

The water tank is only 0.45 gallon, but that will provide mist for up to 9 hours at the machine’s highest output setting. The revolving control dial is easy to use while still offering accurate adjustment of mist output. It is rated for coverage of 220 square feet, so it actually has the capability to humidify good-size bedroom or home office spaces. It also comes with a budget-friendly price tag.

Get the Raydrop room humidifier at Amazon or Walmart.

Best For Large Rooms

Vornado Evap40 4-Gallon Evaporative Humidifier

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What We Like

• Uses a vortex action to spread humidity evenly
• 3-speed fan with built-in humidistat
• 4-gallon tank capacity

What We Don’t Like

• It’s quite a bulky unit

Product Specs 

• Type: Cool mist
• Runtime: Up to 24 hours
• Coverage: Up to 1,000 square feet

Vornado is one of the leading names in air movement, from fans and heaters to air purifiers and humidifiers. The Evap40 provides impressive performance for spaces of up to 1,000 square feet. Not surprisingly, it’s a little more expensive than most of our other top picks, but considering the coverage provided, we think it represents a good value.

The Vornado Evap40 has a unique vortex action that spreads humidity evenly throughout the room. Two 2-gallon water tanks give up to 24 hours of continuous humidity, and they lift out for easy refilling and cleaning, without moving the main unit. There is a three-stage fan and a rotary humidistat allowing users to set precise levels. Two antimicrobial-treated wicks are used with this model, and they must be replaced every 4 to 8 weeks.

Get the Vornado room humidifier at Amazon or Walmart.

Best Whole-house

Aircare MA Console-Style Evaporative Humidifier

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What We Like

• High-performance model for large spaces
• Adjustable humidistat and 4 fan speeds
• Helpful visual alerts

What We Don’t Like

• Area to be humidified must be contiguous

Product Specs 

• Type: Cool mist
• Runtime: Up to 36 hours
• Coverage: Up to 3,600 square feet

There are two types of whole-house humidifiers. The first needs to be connected to HVAC, so fitting will need to be considered in addition to the cost of the unit. The second type are console-style models, like this Aircare MA, which offers coverage of up to 3,600 square feet (of contiguous space) and can run for 36 hours between refills. It’s quite large, but casters make it easy to move around, and the 3.6-gallon water tank lifts out for easy refilling.

Control is via adjustable humidistat and four-speed fan allowing fine control over humidity levels. There are useful indicators for when the tank is empty and the wick needs changing. A demineralization cartridge is also included to provide water that is as free from contaminants as possible.

Get the Aircare room humidifier at The Home Depot, or Walmart.

Jump to Our Top Picks 

How We Chose the Best Room Humidifiers

Room humidifiers can do more than just improve the air quality. They can soothe dry skin, chapped lips, and help relieve a dry throat and common cold symptoms. However, there’s no one-size-fits-all solution, so consumers will want to check the variety available before making their choice.

During our own research, we looked at over 50 of the best room humidifiers currently available before landing on our carefully collated selection. We wanted to incorporate the various types, account for different room sizes, and choose models that were as easy to operate and maintain as possible. We looked for a range of humidifiers that would satisfy every need.

Price is always a consideration, and many of our picks offer excellent value for money. We also included a few high-end models for those who are prepared to pay a little extra for their comfort.

Evan Scobria, founder of Prime Home Humidity based in Bellingham, Washington, provides consumers with the latest information about humidifiers, dehumidifiers, and home humidity. “The mist created by room humidifiers protects wood floors and wood furniture from the damaging effects of overly dry air,” he says. In sum, the devices “are an effective remedy for low-humidity home environments.”

What to Consider When Choosing a Room Humidifier

Getting the best room humidifier for your needs involves considering the differences between warm mist and cool mist models, room size requirements, humidistat features, ultrasonic technology, and cleaning considerations. Additionally, for households with young members, it’s essential to explore child-safe options to ensure a secure and family-friendly choice.

Warm Mist vs. Cool Mist Humidifiers

Both cool and warm mist humidifiers add much-needed moisture to dry indoor air, with slight differences:

• A standard warm mist humidifier brings water to a boil to inject the room’s air with a little extra moisture. The high heat reduces the risk of bacterial transmission, leading it to be considered slightly healthier. Warm mist humidifiers are also typically quieter to operate since steamy mist naturally rises, eliminating the need for an internal fan. They do require additional cleaning because the boiling process leaves behind mineral deposits.
• A cool mist humidifier (also called evaporative) uses a fan to blow air through a damp wick, so it can be noisy when it turns on. Cool mist humidifiers are preferable to warm mist humidifiers in homes with small children since there is no danger of burning little fingers.

Ultrasonic Technology

Ultrasonic humidifiers can disperse a warm or a cool mist, or both. The cool mist option is more common, but some models include an internal heater that facilitates a cool mist in the summer and warm mist in the winter. Instead of utilizing a strong fan, as a standard cool mist humidifier might, an ultrasonic humidifier breaks up water droplets into mist using a ceramic diaphragm that vibrates at a frequency too high to be audible to the human ear. Best of all, most ultrasonic humidifiers are whisper quiet, so they won’t interfere with sleep.

Size

A humidifier that is too small may not be sufficient, while one that’s too large could add so much moisture into the room that droplets appear on furniture and other surfaces. Fortunately, humidifiers are rated by the intended room size.

• A small room humidifier effectively treats rooms with less than 400 square feet of floor space. They are often portable and lightweight, making them a good choice for bedrooms, nurseries, kitchens, and other small spaces.
• Medium-size room humidifiers treat rooms between 400 and 900 square feet and are only semiportable.
• For a room with 1,000 square feet or more, look for a large room humidifier. Large room humidifiers feature bigger water reservoirs and are stationary.

Humidistat

A humidistat is a concept similar to a thermostat on a heater, except a humidistat is used to set the desired humidity. The humidifier will then turn itself on and off automatically to maintain that level. Many room humidifiers have a humidistat, though by no means all. Cheaper models may just pump out moisture at a preset level and need to be turned on and off manually. Unfortunately, this isn’t convenient for rooms that are unattended and can lead to over or under humidification.

Often the humidistat is a sensor with a simple dial, and some experimentation is needed before the preferred level is established. Others allow precise setting of humidity at a given percentage. Smart humidifiers can even allow this to be set or changed remotely.

Cleaning

Humidifiers need regular care for two reasons. First, it keeps them operating at peak efficiency and should prolong their working life. Second, mold and bacteria can build up on the unit, potentially creating a health hazard. The U.S. Environmental Protection Agency general advice is to clean humidifiers every third day, though we would recommend following each manufacturer’s specific instructions for its machine.

Some high-end room humidifiers have cleaning cycles that make life a lot easier. Of course there is a premium to pay for this functionality. Fortunately, cleaning humidifiers by hand is not difficult, usually requiring just white vinegar, water, a scrubbing brush, and a sponge or cloth. The Consumer Products Safety Commission recommends the use of demineralized or distilled water to reduce mineral buildup, though some manufacturers disagree. A few actually warn against their use, so be sure to check instructions for each device.

The post We Researched 57 Humidifiers and Our Top Pick Runs for 60 Hours on One Fill appeared first on Bob Vila.

Best Overall

TopDon TC005 Thermal Camera

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Thermal cameras are vital diagnostic tools for HVAC technicians and mechanics, who use them to identify problems by detecting heat signatures. But they’re also beneficial for homeowners or DIYers who want to locate insulation gaps, troubleshoot electrical issues, or pinpoint leaks and moisture problems. We researched more than 20 bestselling models and chose the TopDon TC005 Thermal Camera for hands-on testing, paying special attention to how easy it was to use the camera and understand its detected temperature ranges.

After some time with the camera, we found that the TC005 provides high resolution, is easy to use, and provides images that can be transferred to a PC for closer inspection. However, the TC005 is just one of many reputable thermal cameras on the market, so we noted a few other models worth considering. Keep reading to learn more about thermal cameras and discover how the TC005 became the top pick in our lineup of the best thermal cameras.

Best Overall

TopDon TC005 Thermal Camera

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What We Like

• Good build quality
• Portable and convenient
• Intuitive controls and operation
• Versatile imaging modes
• Records heat data on each image
• Images can be transferred to computer
• Affordable price point

What We Don’t Like

• Screen is relatively small for on-camera viewing
• Lacks high-end features like multi-spectral imaging

Specs

• Thermal resolution 256 x 192 pixels
• Modes 4
• Runtime 12 hours
• Temperature range -4 to +1022 degrees Fahrenheit (-20 to 550 degrees Celsius)
• Screen size 2.8 inches

Our Ratings: Resolution 4/5; Temperature Range 4.5/5; Display Quality 4.5/5; Ease of Use 5/5; Value 4.75/5 

The TopDon TC005 impressed us right out of the box. We liked its build quality and non-slip ergonomic design. Weighing just over 1 pound, it has enough heft to feel substantial yet is not cumbersome. It comes with a canvas case with a belt loop and a strap for carrying the camera across the body. The package also includes a 16 GB memory card and a USB cord for charging and transferring images to a tablet or PC. 

We liked how intuitive using the TC005 was. It has four imaging modes we could scroll through to find the best visibility depending on what we were looking for. The heat signature was brightest in infrared (IR) mode, but we could also switch to visible light, which was handy if we wanted to take pictures both with and without IR for comparison on a computer later. The other two modes combine infrared and visible light in different degrees.

Taking a photo requires a simple trigger squeeze, and the image is automatically saved to the memory card. Scrolling through the images on the camera display gave us a quick view, but the best way to see them is to upload them to a computer. We downloaded TDView, Topdon’s app for viewing the images, but they can also be opened with other image editing programs, such as Photoshop, Windows Viewer, and Lightroom. 

The TC005 provides vital heat signature information by marking each image’s hottest, coldest, and central temperatures with little bullseyes. It also displays the corresponding numerical temperatures in Celsius or Fahrenheit. 

The TC005 may lack the sensitivity needed for specialized fields such as industrial engineering, but it’s a solid pick for DIYers, home mechanics, and pros looking to detect drafts, insulation issues, and electrical hotspots.

Get the TopDon thermal camera at Amazon or Walmart.

More Thermal Cameras Worth Your Money

While we only tested the TopDon TC005, several other heat sensor cameras made our shortlist. The following models offer a range of sensitivity and features. You’ll find smart camera add-on modules, Wi-Fi-capable models, and high-end thermal detectors. One is sure to meet your heat-detection needs. 

• Flir One Gen 3 Thermal Camera for iOS Smart Phones, available at Amazon or Flir. 
• Flir TG267 Thermal Camera, available at Amazon or Flir.
• Flir C5 Handheld Compact Thermal Camera, available at Amazon or Flir. 
• Flir One Pro LT Pro-Grade Thermal Camera, available at Amazon or Flir. 
• Flir MR160 IGM Moisture Meter, available at Amazon or Flir.
• F2W Thermal Camera with Wi-Fi, available at Amazon.
• Ancel IR101 Thermal Imaging Camera for Android, available at Amazon or Walmart.
• TopDon Thermal Camera for iPhone, available at Amazon.

Jump to Our Top Picks

How We Chose and Tested the Best Thermal Cameras 

In selecting thermal cameras for our lineup, we researched more than 20, narrowing the list based on features, build quality, and consumer feedback, and then chose the TopDon TC005 for hands-on testing. While Flir makes some of the best thermal cameras around, they can be pricey, and we wanted to test a model that would be well-suited to a wide range of users. 

In actual testing, we used the thermal camera in the same ways most DIYers would. We checked around our doors and windows for heat loss. We scanned outlets and monitored plugged-in appliances to see if the cords were overheating. We checked our automobile engine to see if there were any concerning hotspots, and even had a little fun taking thermal photos of our dog. 

We paid special attention to the temperature ranges detected by the TC005 and noted how easy it was to use the thermal camera, and also downloaded the app and used it to view our thermal images. 

What to Consider When Choosing a Thermal Camera

The best thermal camera for your needs can depend on several factors, including size, temperature range, resolution, image enhancement capabilities, and task-specific accessories, such as wall probes for leak detection. Here are a few things to consider before selecting a thermal camera. 

Types of Thermal Cameras

Thermal cameras fall into three main categories based on how they are used. The types are handheld thermal cameras, infrared phone camera attachments, and thermal drones.

Handheld Thermal Cameras

Handheld thermal cameras are commonly used for household inspections and for many industrial applications. This type of heat sensor camera can have a small body the size of a smartphone, or it can be large enough that it necessitates the use of a camera grip for proper focus.

For the majority of thermal camera applications, such as looking inside a home’s walls, floors, or other spaces, a handheld thermal camera is suitable. While these cameras are larger and more expensive than a smartphone attachment, they also may have thermal camera-specific screen resolutions and a wider range of features, including contactless body temperature readings, a built-in laser guide, or a visual light camera. 

Smartphone Thermal Camera Attachments

A smartphone thermal camera attachment allows you to use your smartphone to read the heat signatures of infestations or your electrical, HVAC, and plumbing systems. The attachment plugs into the base of your device so that you can simply control the camera through your touchscreen and upload the collected pictures or scans directly into your phone.

This type of device is inexpensive and easy to use, making it a great option for infrequent or DIY home inspections, but it is not recommended for professional use. This is because cheap thermal camera attachments lack the high image quality and precise measuring accessories that handheld thermal cameras normally offer. They may also drain your smartphone battery quickly, ultimately limiting viewing time.

Thermal Drones

Using a thermal drone for a home inspection might seem like overkill, but there are many issues that cannot be detected from inside the house. Unless you are willing to get up on a ladder or another high perch, a thermal drone is a great way to find out if you have any hidden problems. 

Possible problems that a thermal drone can help detect include nesting insects, such as termites or other animals, blockages in the drainage system, and areas in the roof or exterior walls where heat is escaping, indicating the need to repair a hole. These devices combine the flight capability of a drone with the functionality of a thermal camera. However, they are usually quite expensive and are better suited for those with a professional roofing or home inspection business. It is also possible to find a thermal camera to attach to an existing drone for drone photography. 

Size, Weight, and Grip

The size and weight of a thermal camera are also worth considering if the device is going to be used for any extended period of time. Heavy or large cameras or those with an uncomfortable grip can contribute to or help avoid hand fatigue.

Small thermal camera smartphone attachments are easy to carry, but they don’t have the same kind of stable grip as standalone thermal cameras. Smartphone attachments are great for travel and quick inspections, but they are not suited for long periods of use. Handheld thermal cameras can range in size, but those best suited for comfort typically come with a padded camera grip that is easy and comfortable to hold. Because thermal drones can fly, their size and weight matter less, but the comfort of their handheld controllers determines how long the user can control the drone before hand fatigue sets in. 

Temperature Range

When looking for a thermal camera, you will notice that the manufacturer typically states the minimum and maximum temperatures that the device is capable of accurately reading. Smartphone attachments normally have moderate thermal sensitivity from -4 to 248 degrees Fahrenheit, while handheld thermal cameras may extend the temperature range from -13 to 716 degrees Fahrenheit. 

Larger temperature ranges allow you to detect problems that can’t be seen with the human eye in HVAC systems, hot water tanks, or vehicles. Thermal drones typically have a similar range to handheld thermal cameras, with the added bonus of flying capabilities. When shopping for a camera, keep in mind the highest and lowest possible temperatures you would normally find during your inspection.

Resolution

The thermal resolution of a thermal camera can help a user hone in on potential issues. The more precise a thermal camera is, the easier it is to pinpoint exactly where the problem lies, potentially saving you from making costly mistakes.

For example, a low-resolution camera may present a broad-spectrum image of a plumbing system that vaguely shows an increase in temperature extending outside the pipe. While this information helps to determine that a hot water leak or insulation gap exists, the reading may not show the exact location of the leak. With a higher-resolution camera, you can identify the flow of water and open a hole just wide enough to stop the leak. 

To accurately recognize and diagnose what you are seeing through the thermal camera screen, you need a high thermal resolution. Thermal resolution quality is measured in pixels and can range from as low as the 60 by 60 pixel resolution commonly seen on smartphone attachments to as high as 320 by 240 pixels. A higher resolution may be especially important for professionals looking for a precise thermal imaging device to identify and target repair needs.

Accuracy and Repeatability

Temperature accuracy, which is measured in degrees Celsius or degrees Fahrenheit, is another factor that can help ensure precise readings with a thermal camera. For example, the Occupational Safety and Health Administration suggests that hot water heaters should heat water to a temperature of 140 degrees Fahrenheit to prevent the spread of certain diseases, but the American Academy of Pediatrics recommends a setting of between 120 and 130 degrees Fahrenheit in homes with small children to prevent accidental scalding and burning, and the Consumer Protection Safety Commission has similar recommendations to protect the elderly, so precision is important.

An accurate thermal camera can verify that a hot water heater is performing to the appropriate standard or if it needs to be repaired or replaced. Typical thermal cameras have an accuracy range of plus or minus four degrees Fahrenheit, though there are more accurate thermal imaging cameras.

The accuracy range accounts for several factors that can affect how infrared energy is measured. These can include ambient temperature, camera response, emissivity, transmittance, calibrator temperature accuracy, and atmospheric temperature. The more repeatable a reading is, regardless of these intervening factors, the more accurate a camera will be.

Thermal Image Enhancement

Along with a high-definition thermal resolution, a camera can enhance its thermal image by using overlays of nonthermal video recording. This feature makes visible low-contrast objects even in areas with very wide temperature ranges, allowing you to differentiate between two similar targets. 

The result is a detailed thermal image with overlays of sharp corners and edges that give the objects some identifiable structure. This feature can help identify studs in a wall, plastic pipes, and even furniture in a dark room. It is typically used by firefighters to quickly identify their surroundings so that they can take appropriate actions to put out the fire and help anyone nearby.

Visible Light Image Enhancement

Thermal cameras do not typically need visual light to create thermal depictions of an object or objects. However, it is easier to identify possible problems and anomalies in electrical, plumbing, HVAC, or even automotive systems when the structure is visible to the naked eye. 

To this end, some thermal cameras have a visual light enhancement feature that illuminates low-light video to better highlight the outline and structure of scanned objects. With this feature, you might also be able to change the visual tone and appearance of the output—almost like choosing a photo filter—to find the best view of the problem.

File Formats and Data Output

Thermal cameras don’t only allow you to view and identify possible issues in real time. They can also be used to take a picture or video, which you can then send to your repair technicians so that they are better informed before showing up to help fix it. 

Home inspectors and many other industry professionals who use thermal cameras regularly need to be able to take photos, store them, and even send them wirelessly to others. Thermal cameras may have BMP or JPEG file formats. BMPs can be difficult to convert to a readable form, while JPEGs can be read by most devices.

Data can be saved on the camera or it can be saved on a computer or another device. This usually requires a USB-C cord, but some cameras can connect to Wi-Fi. A thermal camera snap on attachment can send data directly to the connected smartphone, where it can be read much like on a computer.

Companion Tools

Thermal cameras can be used for many different purposes and typically do well as standalone tools. However, many thermal cameras come with accessories designed to help detect specific problems, such as using moisture meter probing bars to better find plumbing leaks. Another frequent companion tool is a voltage detector that can detect the presence of electrical voltage with vibration, lights, or sound alarms. 

Depending on the purpose, a variety of useful companion tools including clamp meters, moisture pens, voltage detectors, moisture detectors, and even thermoprobe connectors that can infrared measurements through narrow gaps may augment the usefulness of the camera. 

Tips for Using a Thermal Camera

Though most thermal cameras are pretty straightforward, there are a few things to keep in mind in order to ensure accurate temperature readings. One of the most important points is to steady the aim of the camera and ensure you have the correct resolution and optics for the type of temperature measurement required. 

You should also check that your field of view is suitable for the type of measurement you are taking. For example, if you are closely inspecting your home, a wider field of view on your thermal camera may be more effective. Alternatively, when scanning things at a distance, a narrow view may be ideal. Here are a few more tips to consider before using a thermal camera: 

• Ensure you understand the colors produced on a thermal camera. Standard colors are red, orange, and yellow for heat and blue and green for cooler areas. 
• Adjust the focus and field of view on your camera before and during readings to ensure clarity and accuracy. 
• If your thermal camera runs on battery power, make sure to carry a charger or extra battery with you while taking measurements. 

FAQs 

After learning about the features of thermal cameras, you may have some lingering questions. The answers below may help you decide which kind of thermal camera is right for your purposes.

Meet the Tester

Glenda Taylor is a contractor, product tester, and writer focusing primarily on construction, DIY tools, and home appliances.

Additional research provided by Timothy Dale.

The post The Best Thermal Cameras appeared first on Bob Vila.

Humidifiers help increase the moisture content in a room. Many individuals rely on humidifiers to combat dry skin and lips, and lessen congestion and other cold and flu symptoms, especially during dry winter months. While a warm-mist humidifier requires hot water to produce water vapor, a cool-mist humidifier is considered a safer alternative since it does not require the use of boiling water. 

There are two types of cool-mist humidifiers: ultrasonic and evaporative. They work in very different ways to produce water vapor and increase humidity in a room. Learning the differences makes it easier to decide which type of humidifier is best for your situation. 

What is an ultrasonic humidifier? 

One of the key differences you’ll notice when you’re researching vaporizer vs. humidifier is the way the water vapor is made. Unlike vaporizers and warm-mist humidifiers that boil water to make steam, ultrasonic humidifiers do not have a heating element and are considered a type of cool-mist humidifier.

Ultrasonic humidifiers expel an ultra-fine mist into the air through the use of high-frequency sound vibrations of the two inner ceramic plates. After the tiny water droplets are released into the room, they evaporate. As they continue to release into the room, they increase the humidity in the space. 

What is an evaporative humidifier?

While also considered to be a cool-mist humidifier, evaporative humidifiers work quite differently from ultrasonic humidifiers. They rely on the basic principles of evaporation to increase the moisture content in a room. When you place a large bowl of water in a room, the water will evaporate and make the room more humid.

Evaporative humidifiers speed up this natural process of evaporation by using a fan and a wick filter. The fan in the humidifier pulls in air and blows it through the wick filter at the humidifier’s base. This causes the water to evaporate and turn into water vapor. The water vapor is then pushed into the room to increase its humidity. 

Differences Between Ultrasonic and Evaporative Humidifiers

	Evaporative Humidifiers	Ultrasonic Humidifiers
Ease of Cleaning	Regular filter maintenance to prevent mold	Frequent cleaning to prevent bacterial growth
Energy Efficient
Large Coverage Area
Noise Level	(noisy fan)	(super quiet)
Cost	Higher upfront cost (and needs replacement filters)	Lower upfront cost (and less maintenance)
Air Quality	(filters)	(can release white dust if used with hard water)
Design	Large and less portable	Compact and lightweight

Ultrasonic humidifiers can disperse minerals and other contaminants into the air.

Because ultrasonic humidifiers don’t have a filter, any minerals or contaminants found in the water used to fill their tank will also be released into the air. Calcium, magnesium, potassium, and other minerals are all commonly found in tap water. These minerals are released as gray or white dust that may settle on the flooring or furniture in the space. How much dust gets released can vary based on the water used. For example, hard water has a higher mineral content, so it can yield more dust. 

The EPA recommends using distilled water to fill an ultrasonic humidifier’s tank. Distilled water still contains some minerals, but at a much lower concentration than tap water. Using distilled water not only reduces the amount of gray or white dust released by a humidifier, it will also decrease mineral deposits and scale inside the humidifier. Without regular cleaning, the humidifier’s insides can become a breeding ground for bacteria and microorganisms.

Ultrasonic humidifiers tend to be more aesthetically pleasing.

When considering a humidifier room strategy and aesthetic appeal, many prefer the look of ultrasonic humidifiers. Evaporative humidifiers are generally bulkier since they have to hold a fan and a filter; the humidification device of an ultrasonic humidifier is much more compact. Those looking for a small humidifier will typically have a much easier time finding an ultrasonic model than an evaporative model.

Ultrasonic humidifiers may also offer additional features that add to their aesthetic appeal, such as a built-in clock or colored LED night lights.

Evaporative humidifiers require filter maintenance.

The filter in an evaporative humidifier works to reduce the amount of mineral dust released. However, filters also mean that you’ll have to monitor and replace the filter regularly. How often you use a humidifier will impact how often you’ll need to replace the filter, but manufacturers usually recommend using a new filter every 1 to 3 months.

Both evaporative and ultrasonic humidifiers need to be cleaned regularly, which is at least once a week. This will help remove mineral buildup and prevent the growth of bacteria. White vinegar mixed with water can be quite effective for cleaning a humidifier, but be sure to consult with the care instructions for the specific model you purchase.

Ultrasonic and Evaporative Humidifiers: Our Top Picks

Best Evaporative Humidifier

 

 

Our Recommendation: Levoit Superior 6000S Smart Evaporative Humidifier – Get at Amazon for $249.99.

This evaporative humidifier from Levoit is our favorite humidifier for large rooms, suitable for areas up to 3,000 square feet, so it’s a great option for a large family home or an open space. It features multiple settings and an internal dispersal fan to provide an even spread. You’ll also be thrilled to hear that this model works with regular tap water, thanks to its filter, so you don’t need to worry about keeping a stock of distilled water.

 

Best Ultrasonic Humidifier

 

 

Our Recommendation: Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier – Get at Amazon for $39.99 

This ultrasonic humidifier offers up to 25 hours of constant quiet operation with its 1.5-liter tank. The 360-degree nozzle and two speed settings work together to ensure that the ideal amount of mist is released into the room to match your humidity needs. The humidifier also features a night light setting and automatic safety shut-off feature. It received the Best Bang for the Buck designation in our researched guide to the best room humidifiers.

Ultrasonic humidifiers are quieter than evaporative humidifiers.

As their name implies, ultrasonic humidifiers use sound waves with a high frequency. Human ears are not able to detect such a high frequency, which means that an ultrasonic humidifier is quiet. If you’re looking for a bedroom humidifier, choosing an ultrasonic model will help ensure that your humidifier doesn’t disrupt your sleep. A standard ultrasonic unit will operate below 30 decibels, making them virtually silent. 

While some evaporative humidifiers are louder than others, all evaporative humidifiers will produce some sound because they use a fan to help the water evaporate more quickly. The fan runs constantly, so models with a quieter fan will still be louder than an ultrasonic humidifier. Most models will range between 28 and 45 decibels, depending on the fan speed, which may be better if you prefer a little white noise while you sleep.

Evaporative humidifiers tend to cost less than their ultrasonic counterparts.

Ultrasonic humidifiers are usually cheaper than larger evaporative models. The difference being, though, is that ultrasonic models are usually a lot smaller and less capable of handling large spaces. 

Beyond the initial cost of evaporative and ultrasonic humidifiers, there is also the cost of filter replacements to consider. While ultrasonic models do not require a filter, the filter in an evaporative humidifier will need to be changed every 1 to 3 months. Replacement filters are relatively inexpensive, but the cost can add up over several months or years of operation and may eventually lead to evaporative humidifiers becoming a pricier investment.

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