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Best Humidity Sensing Bathroom Fans of 2021

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Remove moisture the easy way with a humidity sensing bathroom fan.

Okay, so what is so special about a bathroom exhaust fan with a humidity sensor? Well, for one thing, they take the hassle out of extracting moist air and odors from your bathroom. They also keep your inside space free of mold and mildew.

The best humidity sensing bathroom fans do this automatically. Let’s take a look at your options.

Our Top Picks

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Image
Model
Product Comparison Table
Features
Product Image of the Panasonic FV-0511VQC1 WhisperSense DC Ventilation Fan, 50-80-110 CFM
Best Quiet Fan
Panasonic WhisperSense Fan
  • Pick-a-flow speed selector
  • So quiet at 0.3 sones
  • Energy Star rated
Product Image of the AC Infinity AIRLIFT T10, Shutter Exhaust Fan 10-inch with Temperature Humidity Controller - Wall Mount Ventilation and Cooling for Sheds, Attics, Workshops
Best Wall-Mounted Fan
AC Infinity AIRLIFT T10 Fan
  • Smart programming feature
  • Service life of 67,000 hours
  • Accurate moisture & temp. reading
Product Image of the Delta BreezSmart SMT130H 130 CFM Exhaust Bath Fan with Adjustable Humidity Sensor and Speed Control
Best Adjustable
Delta BreezSmart Exhaust Fan
  • Fan speed of 130 CFM
  • Adjustable humidity levels
  • Consumes less than 17 W of power
Product Image of the Homewerks Worldwide 7146-80-MS Bathroom Fan Integrated Dimmable LED Light Humidity Sensor Exhaust Ventilation 1.5 Sones 80 CFM, Smart Motion White
Best With Light
Homewerks Worldwide Bath Fan
  • Dimmable LED light
  • Multi-function control switch
  • 24-Watt motor
Product Image of the Delta BreezSlim SLM70H 13.1W Exhaust Bath Fan with Humidity Sensor
Best Budget Fan
Delta Electronics Breezslim Exhaust
  • Wall or ceiling installation
  • Brushless motor
  • Value for money

How Do Humidity Sensing Bathroom Fans Work

The fan is fitted with a humidity sensor, which is an electrical component that senses when the moisture content in the air reaches a set level before it kicks in. The sensor is combined with a thermometer to get an accurate reading of the temperature.

Some exhaust fans allow you to adjust the levels of humidity for when the fan turns on. The typical levels range between 25 and 75 percent.

There are 3 ways the fan works.

  • No Switch: This method keeps the fan in a permanent operational state so that no one can turn it off. This is the best option for rental properties or when you have children.
  • Independent Switch: This enables you to install the fan on separate switches so that you can keep the light, the fan, and any other features on independent controls.
  • Same Switch: This is the most common installation method. When you switch once, it operates the humidity sensor, and flicking it a second time works the fan.

Benefits of a Humidity Sensing Bathroom Exhaust Fan

There are many advantages of installing a humidity-sensing bathroom fan.

Protection

The first and last purpose of a bathroom exhaust fan is to protect your space from moisture and odors. Excessive dampness in the air causes mold and mildew growth that leaves unsightly black marks and damages surfaces.

Automatic Usage

Humidity sensing fans switch on automatically when the moisture content of your bathroom reaches a specific level. It takes away the hassle of remembering to switch it on every time you take a shower.

This is ideal if you have children who regularly forget to switch the fan on, or tenants in a rental property who are less conscientious about moisture control. Damp air penetrates fixtures and fittings, even rusting metal door furniture and water pipes.

Auto Shut-Off

Forgetting to turn off the fan is just as bad as not switching it on. How many times have you showered and gone to work with the fan still running? Imagine the costs?

Not only does this waste electricity, but it also sucks warm or conditioned air from your home, extracting it to the outside. It’s a bit like putting the heating on and opening a few windows for the entire day.

It also prevents fire risks because the fan cuts out, unlike fans that continue to run, causing heat build-up and a potential fire.

What Humidity Should My Bathroom Fan Be Set At?

The recommended humidity levels in our homes should be about 50 to 60 percent, so you should set the percentage values between 25 and 75 percent inside your bathroom.

How To Choose a Humidity Sensing Bathroom Exhaust Fan

What are the important decisions you need to make when shopping for a new humidity sensor bathroom fan? Let’s take a look.

Adjustable Sensor

Adjusting the moisture reading sensor gives you the freedom to set your percentage values to cater to how you use the bathroom. You might have a large family, and the bathroom gets a lot of use. Or the reverse may be true and it only gets light use.

Most sensors get set between 25 and 75 percent. Remember to check if the sensor is customizable because not all fans have this ability.

Fan Strength

We’ve already mentioned CFM values, and the strength of your fan is judged on airflow. The higher the CFM, the more powerful the fan. This is important if you want to size your bathroom exhaust fan correctly.

If the CFM values are too low, you might struggle to extract the moisture from the room, causing mold and mildew to form.

When sizing your fan, the general rule of thumb is you should allocate 1 CFM to every square foot of floor space. It is a good idea to add 10 CFM to the final total for extreme moisture days and if you ever upgrade your bathroom fittings.

Single or Adjustable Fan Speed

Single-speed exhaust fans run at one speed only, so depending on the bathroom usage, your fan will always run at the maximum level. Adjustable models typically have 3 settings, enabling you to cater to light, medium, and heavy bathroom usage.

The most common settings are 50, 80 and 100 cubic feet per minute (CFM). Check the fan’s specifications to see if it has this feature.

Noise Levels

Bathroom fans are measured in sones when dealing with volume levels. Typically, fans operate at about 3 to 4 sones, but you can get whisper-quiet ones that barely produce more than a faint rush of air.

Quiet bathroom exhaust fans should have a sone value of less than 1.0, but some models are as quiet as 0.3 sones. This is the best fan when you have young children you want to avoid waking.

Shape and Size of Your Bathroom

If your bathroom has odd shapes and corners, it will affect how successful the fan is at removing moisture. And where you decide to place the fan is crucial too. If you have a large room and you situate the exhaust fan at the furthest point from the bath or shower, you will have damp air lingering for longer than it should.

It might be worth thinking about zoning the room so that you can place the fans effectively.


The Best Humidity Sensing Bathroom Exhaust Fans of 2021

After much research, we bring you our top 5 humidity sensing bathroom fans.

1. Panasonic FV-0511VQC1 WhisperSense Ventilation Fan

Best Quiet Humidity Sensing Bathroom Exhaust Fan

This Panasonic is so quiet that you will struggle to hear it. It operates at 0.3 sones, which is softer than rustling leaves. These fans are ideal when you have young children or older relatives that wake easily in the night.

It has a Pick-a-Flow speed selector that enables you to choose between 50, 80, and 110 CFM, depending on the occasion. It also comes with a Flex-Z easy bracket that makes connecting the 4 or 6-inch ducting a breeze.

It is Energy Star rated, so it will save you money on energy costs, and it has a low profile, meaning it sits almost flush with the ceiling.

Why We Love It

So Quiet

If you can find a quieter exhaust fan, we salute you. This model is barely audible, making it tricky to see if it’s actually working.

Easy Installation

Thanks to the Flex-Z bracket, connecting up the ducting takes less time than you think. It also accommodates 4 or 6-inch diameter ductwork.

Pick-a-Flow Speed Selector

Adjusting the CFM speed gives you more freedom and versatility to cater to light or heavy bathroom usage. It also helps in the fight against odors and mildew.

Keep In Mind

Quite Expensive

This Panasonic exhaust fan is not a budget option. It costs considerably more than other models featured in the list. That said, it is quiet and performs masterfully.

Additional Specs

Weight 9.5 pounds
Dimensions 13 x 13 x 7.38 inches
CFM 50, 80, 110
Sones 0.3
Energy Star rated Yes
Price $$$

2. AC Infinity AIRLIFT T10 Exhaust Fan

Best Wall-Mounted Humidity Sensing Bathroom Exhaust Fan

Sometimes the best location for the exhaust fan is in the wall. If you live in an apartment where the ceiling option is not available, a wall-mounted fan is the answer. This AC Infinity model is really powerful, with a smart programming feature that allows you to set the humidity levels.

You also get accurate moisture and temperature readings, as well as a saving of 40 percent in energy costs. They even give you speed control, a timer, and an alarm. This unit is robust, so it should last for years, thanks to the dual-ball bearings rated at 67,000 hours.

Why We Love It

Durable Construction

This model features galvanized steel shutters, aluminum fan blades, and dual-ball bearings that have a useful working life of 67,000 hours.

No Duct Work

Installing this fan is a breeze because it fits a hole in the wall rather than connecting to ducting in the ceiling. It makes it easy to mount.

Programmable

You can program the timer, the humidity settings, and the speed control to get the precise extraction performance you want. You can cater it to your family’s needs.

Keep In Mind

Noisy

This fan operates at 58 decibels, so while it isn’t super-loud, it is noisier than standard ceiling exhaust fans. Bear this in mind when you buy one as it may wake the family in the middle of the night.

Additional Specs

Weight 9.78 pounds
Dimensions 13 x 13 x 7.38 inches
CFM N/A
Sones 4.0
Energy Star rated No
Price $$

3. Delta BreezSmart SMT130H Exhaust Fan

Best Adjustable Humidity Sensing Bathroom Exhaust Fan

If you like being in control of your humidity levels, this fan will put a smile on your face. You can set the levels between -50 percent and +90 percent. That covers all eventualities without a doubt.

When the moisture levels exceed the highest set point, the fan runs at a speed of 130 CFM. When the levels drop, the fan moves at a slower pace of 50, 70 or 90 CFM.

It operates at 0.3 sones, so it rivals the Panasonic for volume levels, and because it is Energy Star rated, it consumes less than 17 watts of power.

Why We Love It

Super-Adjustable

This model gives you the flexibility to set the humidity levels across a vast range from -50 to +90 degrees. That covers all bathroom usage options and climates.

Super-Quiet

The volume this fan produces is barely audible to the human ear. It generates just 0.3 sones, which is quieter than rustling leaves.

Energy Star Rated

This fan consumes 17 watts of power, making it incredibly frugal and cheap to run. That’s why it is rightly Energy Star rated. You can save up to 67 percent on your energy costs.

Keep In Mind

Very Pricey

This fan is not cheap. You will spend double the cost of others on the list. That said, it is a quality exhaust fan and comes highly recommended.

Additional Specs

Weight 1 pound
Dimensions 14 x 14 x 7.68 inches
CFM 50, 70, 90, 130
Sones 0.3
Energy Star rated Yes
Price $$$

4. Homewerks Worldwide 7146-89-MS Bathroom Fan

Best Humidity Sensing Bathroom Exhaust Fan With a Light

Not only does this exhaust fan have a humidity sensor, but it also has a soothing LED light with a dimmable feature to set the mood in the bathroom. It is a single-speed fan, so it only operates at 80 CFM but is quiet at just 1.5 sones.

You can set the humidity sensor to auto-on to kick in when the fan detects dampness in the air and cuts out when it drops below 60 percent. The light is also motion-activated, so when you walk into the room, it comes on automatically. That’s a real bonus if you have kids.

You also get an LED wall switch that lets you take complete control of the functions, even switching off the auto-humidity sensor if you so choose.

Why We Love It

Dimmable LED Light

Rather than switching on the bathroom light, using the motion sensor light is a super-convenient way to light the room. Kids and elderly relatives will love this feature.

Multi-Function Control Switch

The LED control panel allows you to choose the settings that best suit the way you use the bathroom. You can also select manual or auto-humidity detection.

24-Watt Motor

This fan copes well in bathrooms that are 80 square feet or less. The 24-watt motor generates enough power to operate the light and the fan, along with the humidity sensor.

Keep In Mind

Single-Speed

For such an advanced fan, it is disappointing that it only has one running speed. It means you always run at the maximum of 80 CFM regardless of the humidity levels.

Additional Specs

Weight 8.8 pounds
Dimensions 10.2 x 10.2 x 7 inches
CFM 80
Sones 1.5
Energy Star rated No
Price $$$

5. Delta Electronics Breezslim SLM70H Exhaust Fan

Best Budget Humidity Sensing Bathroom Exhaust Fan

Now we reach the budget end of the spectrum. This exhaust fan costs far less than the competition, which makes it a great starter fan. It has a humidity sensor that kicks in when the moisture levels in the air exceed 60 percent and stops when it drops below.

It operates at 2.0 sones, so it isn’t the quietest, but for the price, what do you expect? This model is approved for wall and ceiling installation, so you get the flexibility, and the Energy Star qualified motor is brushless, giving you the latest in efficiency savings.

Why We Love It

Budget Pricing

Why spend big when you can get your hands on a budget model that seems to do all the things the premium fans can do?

Brushless Motor

Brushless motors are the latest in design, saving you money by increasing the energy efficiency of the fan. It also improves reliability, as the motor has no brushes. Brushes are notorious for needing replacing every few years.

Energy Star Qualified

The brushless motor certainly helps, but who would have thought a fan this cheap would be so frugal with electricity. It’s a win-win on price and running costs.

Keep In Mind

Loud Operation

This fan is a lot noisier than others that made the list. It is predictable given the price, but it is something to bear in mind when you make your purchase.

Additional Specs

Weight 4 pounds
Dimensions 7.2 x 7.5 x 3.9 inches
CFM 70
Sones 2.0
Energy Star rated Yes
Price $

Humidity Sensing Bathroom Fan Comparison Chart

Product Best Weight Dimensions CFM Sones Energy Star rated
Panasonic WhisperSense Ventilation Fan Quiet Fan 9.5 lbs 13 x 13 x 7.38″ 50, 80, 110 0 Yes
AC Infinity AIRLIFT T10 Exhaust Fan Wall-Mounted 9.78 lbs 13 x 13 x 7.38″ N/A 4 No
Delta BreezSmart SMT130H Exhaust Fan Adjustable 1 lb 14 x 14 x 7.68″ 50, 70, 90, 130 0 Yes
Homewerks Worldwide Bathroom Fan With Light 8.8 lbs 10.2 x 10.2 x 7″ 80 2 No
Delta Electronics Breezslim Exhaust Budget Pick 4 lbs 7.2 x 7.5 x 3.9″ 70 2 Yes

Are You a Fan of Fans?

Humidity sensing exhaust fans are the ultimate in convenience and hassle-free moisture extraction. You don’t need to think about it or worry you have left the fan on all day and it is perfect for young children.

It’s like having an all-seeing eye watching over your bathroom, activating and deactivating the fan when needed, so you don’t have to. What could be better?

Headshot of Mark Weir

About the Author

Mark Weir

Mark spent 24 years working in real estate, so he knows his way around a home. He also worked with contractors and experts, advising them on issues of planning, investments, and renovations. Mark is no stranger to hands-on experience, having renovated his own home and many properties for resale. He likes nothing better than seeing a project through to completion.

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