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Trying to maintain the temperature in one's attic can be a real pain during the hot summer months. Thankfully, you have the option of investing in an attic fan thermostat to reduce your AC bills.

Best Attic Fan Thermostats
9.5 Ventamatic XXFIRESTAT 10-Amp Adjustable Programmable Thermostat with Firestat for Power Attic Ventilators, Replacement Thermostat , White
TOP PICKAn energy efficient solution for attic fan operation
9.3 Ventamatic XXDUOSTAT Adjustable Dual Thermostat/Humidistat Control for Power Attic Ventilators
RUNNER-UPA thermostat and humidistat rolled all into one
9.0 BN-LINK Digital Cooling Thermostat Controller for Cooling Device Circulation Box Fans 40-108F 8.3A 1000W
An ergonomic plug-in thermostat
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Installation · Setup · Maintenance · Repairs · Replacements

What is an Attic Fan Thermostat?

The topmost level of any building is generally hot and stuffy during summers because of the amount of direct sunlight it receives. Even though most attics feature built-in vents for ventilation purposes, they're unable to tackle the heat building up in a room because they can only throw hot air out. 

On the other hand, attic fans not only help in expelling hot air, but they also work to bring cool air in from the outside. Similarly, an attic fan thermostat works to control the function of the fan by automatically turning it on and off and preserving the temperature at optimal levels.

How do I install an Attic Fan Thermostat?

Typically, you'll find two types of thermostats on the market – some require hard-wiring, while others function more like outlets. Some digital thermostats are plug-in devices that you simply connect to your attic fan.

Conversely, installing an attic fan thermostat that requires hard-wiring is a little trickier. It involves mounting the thermostat near a rafter (or beam) and then attaching the wiring of the power supply and the fan according to the instructions accompanying the thermostat. Be sure to follow all the precautions listed in the instructions when hard-wiring these units. Remember, safety always comes first. 

9.5
TOP PICK
An energy efficient solution for attic fan operation

Not only is the Ventamatic thermostat extremely efficient at conserving energy, but it also offers a diverse temperature range (from 50-120°F).

Top Features
  • Ensures shutting off fan function in temperatures exceeding 183°F.
  • Can control up to 3 units.
  • Doesn’t exceed 10 amps of power use.

Ventamatic has been a part of the ventilation industry for more than half a century. Their brand name is synonymous with quality and value. 

That's also one of the reasons why the Ventamatic 10-Amp Adjustable Programmable Thermostat is the frontrunner in our list of top attic fan thermostats. Not only is the Ventamatic thermostat efficient at conserving energy, but it also offers a diverse temperature range (from 50-120°F). That means that no matter the heat level, you can use this thermostat to control your attic fan for optimal temperature maintenance. 

However, since the user is in charge of establishing the preferred temperature setting, you need to choose a temperature that's not too high or low for the thermostat to do its job. For instance, if you set the shut-off temperature too low – the thermostat will have the fan work continuously. On the other hand, a temperature setting that's too high means the thermostat will shut off the fan without proper ventilation having occurred. 

Safety Features

This thermostat also boasts a safety feature that ensures fan function is shut off when temperatures exceed 183°F  so you don't have to worry about rushing up to the attic every time the mercury spikes. 

Even though the Ventamatic programmable thermostat requires hardwiring, it comes equipped with practical instructions (including a diagram) and wood screws to help mount the thermostat. 

This conveniently priced item is compatible with gable-mount power attic ventilators, roof ventilators, exhaust vents, etc., and can be used in garages, sheds, and greenhouses too. 

Apart from a massive 10-year warranty, there's also the fact that this thermostat can control up to 3 units without exceeding 10 amps of power use. This thermostat is sturdily constructed, durable, reasonably priced, and a buyer favorite – in other words, it's difficult to beat as a thermostat.

What we liked
  • A diverse temperature range (from 50-120°F).
  • 10-year warranty.
  • Comes with instructions, wiring diagram, and wood screws for mounting.
What we didn't like
  • Not meant for commercial use.
9.3
RUNNER-UP
A thermostat and humidistat rolled all into one

Another one of Ventamatic's creations, the Duostat, is the perfect solution for buyers looking for temperature and moisture control.

Top Features
  • Can help reduce heat and dampness from your attic.
  • Offers a temperature range from 50°F to 120°F.
  • Offers a humidity range from 30 to 90%.

Another one of Ventamatic's creations, the Duostat, is the perfect solution for buyers looking for temperature and moisture control. 

The Duostat is ideal for homeowners living in humid climates and can help reduce heat and dampness from your attic. When moisture builds up in your attic, it can cause all sorts of troubles – from deteriorating roofing components to the development of mold and mildew. 

Moreover, damp and moldy spaces can cause health conditions like respiratory infections, sinusitis, asthma, etc. And, individuals suffering from compromised immune systems can face increased inflammatory responses due to mold spores. 

But, you can avoid all these health-related roadblocks by investing in the Duostat. 

Reduce Energy Bills

Another advantage of using products like this one is that you can cut down on your energy bills by making sure your attic fan operation is regulated according to your needs. For instance, the Duostat offers a temperature range from 50°F to 120°F – which means you can use it to control the climate of your attic in summers and winters alike. 

Even though this product offers a humidity range from 30 to 90%, the general setting for your attic ventilator will not likely exceed 90 – 110°F. You must determine the right temperature (and humidity) setting to make sure your attic fan doesn't run continuously or produce incompetent ventilation. 

Additionally, the Ventamatic Duostat thermostat can control up to 3 devices that do not exceed more than 10 amps of energy consumption. It's easy to install and set up, thanks to its concise wiring instructions, and it also comes with a limited lifetime guarantee for product replacement. 

What we liked
  • Can control up to 3 devices.
  • Offers energy efficient attic ventilator fan operation.
  • Limited lifetime guarantee for product replacement.
What we didn't like
  • Some users have complained about the product’s humidity sensors.

If you're on the lookout for a thermostat that promises ease of use and efficiency, then this is worth a look.

Top Features
  • Temperature range that spans from 40-180°F.
  • Easy to install.
  • Digital display to help keep track of the temperatures.

If you're on the lookout for a thermostat that promises ease of use and efficiency, then the BN-Link Digital Cooling Thermostat is worth a look.

Installation 

The thermostat has a temperature range that spans from 40-180°F. It is also easy to install: all you need to do is place the probe, plug the cooling device of choice in, connect the thermostat to a power source, and voila! – you're good to go.

Setting up the preferred temperature is pretty stress-free, too. The product's digital display helps you keep track of the temperatures at all times, in both Celsius and Fahrenheit. Additionally, the thermostat has a 2-3 degree buffering zone that helps it power on again after the optimal temperature has been reached. 

Uses

The BN-LINK cooling device thermostat can be paired up with greenhouse fans, shed fans, and attic ventilator fans. You can even use this device to regulate refrigeration and fermentation temperatures. 

Aside from being ETL listed (found in compliance with national standards), the product also features a sturdy construction that promises durability – all due to its plastic housing. The thermostat also includes LED indicator lights that you can use to operate the product in low-light settings. 

Although the BN-LINK thermostat doesn't feature a humidistat like Ventamic's Duostat, it still manages to hold its own due to its striking price-performance ratio.

What we liked
  • 2-3 degree buffering zone.
  • Varied range of use.
  • LED indicator lights.
What we didn't like

Other Attic Fan Thermostats

Top Features
  • Offers buyers the convenience of temperature and humidity control.
  • Includes a controllable temperature range of 60 to 120°F.
  • Runs on 120V (10 amps).

The ILiving ILG-001TH thermostat offers buyers the convenience of temperature and humidity control by automatically shutting the ventilation device on and off. The product weighs 1.15 lbs. approximately and measures 7x3x2 inches in size. 

The device includes a controllable temperature range of 60 to 120°F. And its humidity control range spans from 30 to 90 percent. As far as power consumption is concerned, the  ILG-001TH runs on 120V (10 amps) – which is quite in line with other products in the attic fan thermostat category. 

The thermostat by ILiving includes a product manual to aid in installation. However, you needn't worry about product quality because not only is the brand based in the U.S, but it also offers a diverse range of products in the home and health niche.

Top Features
  • Plug-and-play temperature controller.
  • Can measure temperatures between 58-230°F.
  • 4-numbered digital display.

The WILLHI WH1436 temperature controlling device can be described as a plug-and-play thermostat. It lets users enjoy seamless attic ventilation without stressing about wiring or electricity bills. 

The thermostat barely weighs 1 lb. and measures 4.9×3.9×1.8 inches. This means you can place it anywhere without it sticking out like a sore thumb. It has a 3-prong plug, a digital display, and a power consumption limit of 3W. The WH1436 also features a 9-ft. long sensor probe that can measure temperatures between 58-230°F. 

You can use the WILLHI temperature controller with heating and cooling devices, such as seedling heat mats, electric ovens, and attic ventilator fans. To put things simply, the WILLHI temperature controller can come in handy all around your house for several functions. 

Top Features
  • Temperature range covers 58-248°F.
  • Separate sockets for heating and cooling appliances.
  • 6.5-ft. long sensor probe.

Another top-of-the-line plug-and-play digital temperature controller is the Inkbird ITC-308. This item ticks several boxes when it comes to efficient energy control, and here's why.

The ITC-308 requires little to no installation pains. Place the device, plug the heating/cooling appliance of choice in, and connect the controller to a power source. Much like the WILLHI WH1436, the Inkbird controller's temperature range covers 58-248°F. This device features separate sockets for heating and cooling appliances. It also has a (high and low) temperature alarm, and a 6.5-ft. long sensor probe. 

There's also a user manual to aid users in setting up the device according to their temperature needs. Not to mention, the ITC-308 has a maximum output load of 110V. It also has a compressor delay safety function to protect your refrigerator. 

Top Features
  • Covers 60-120°F.
  • Designed to work with attic fans specifically.
  • Comes equipped with a wiring diagram.

The final selection in our list of temperature controllers is the Nutone RHT95 attic ventilator thermostat. This model isn't a plug-and-play device like the WILLHI and requires proper placement and wiring to function. 

Its temperature range covers 60-120°F, and it's been designed to work with attic fans specifically. The product's overall weight is 8.8 oz. and it measures 3x1x2 inches in dimension. The RHT95 comes equipped with a wiring diagram much like the Ventamatic thermostats.

Common Questions

Why use an attic fan thermostat or humidistat?

An attic fan's primary job is to increase the existing air circulation in the attic (If there are vents already in place for air to enter the space). Attic ventilator fans can help equalize the temperature inside a room within 9-10 degrees of the outside temperature. 
 
However, to make sure you don't end up running massive energy bills and have your attic fan functioning at optimal levels, you need to augment it with a thermostat/humidistat. An attic fan thermostat can help turn your fan on and off automatically according to your preferred temperature setting.

Similarly, a humidistat can help control the moisture levels of the attic, preventing problems like dampness and mold.

What setting should my attic fan thermostat be at?

Generally, an attic thermostat should be set at 90-95°F in the summer. Setting it any lower could result in your attic ventilator fan running continuously. That can end up hurting your wallet due to energy costs, and it could lead to your attic fan overheating. 

In the winter, your humidistat setting should typically be within the range of 40 to 50%. This will ensure the heating inside your home doesn't result in excess attic moisture and keep you safe from developing mold or mildew on the roof structure. 

The Verdict

Attic fan thermostats can go a long way in making your life easier when it comes to attic ventilation. Not only do they promote low power consumption, but they're also ideal for maintaining optimal temperatures – no matter the season.

However, investing in a thermostat with humidity control is also highly recommended so that your overall attic ventilation needs are taken care of.

9.5
TOP PICK
An energy efficient solution for attic fan operation

Not only is the Ventamatic thermostat extremely efficient at conserving energy, but it also offers a diverse temperature range (from 50-120°F).

Top Features
  • Ensures shutting off fan function in temperatures exceeding 183°F.
  • Can control up to 3 units.
  • Doesn’t exceed 10 amps of power use.
Need Help with a Thermostat?
Get a Free Estimate from a Trusted Local Pro
Installation · Setup · Maintenance · Repairs · Replacements

Sources

Ventamatic

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