Product Features

We would like to take this opportunity to introduce a new product that was released this year by US Sunlight (the makers of your solar attic fan). The new product is a controller that is compatible with your existing fan. Right now your fan will only run when the sun is out. On cloudy days or on summer evenings when you may need it the most it is not running. This controller will give you the power to turn the fan on when you want it on. It also will inform you of the temperature and humidity in your attic.

Power your fan after dark

The addition of the Solar Controller with Dual Mode Technology will enable your Solar Powered Attic Fan to run after sunset or when there is no light available from the sun. When there is no sunlight available to power the fan and the Solar Controller has the optional house power connection enabled, the Solar Controller will cycle house electricity for 8 minutes every half-hour in order to power the fan. This will allow your attic temperature to continue to drop after sunset and help remove the hot, stagnant air that can build up on those warm summer evenings.

Temperature Sensor

Monitors attic temperature and will turn on the fan when the temperature reaches 80 degrees and turns off the fan when the temperature dips below 77 degrees. This allows the fan to only run when it is necessary to vent hot air from the attic space.


The built-in humidistat monitors attic humidity and will turn on the fan if the attic air reaches 75% relative humidity and will turn it off at 65% relative humidity. Too much humidity in the attic can cause condensation on the surfaces which can lead to the growth of mold and mildew.

Won’t this add significant cost to my electric bill?

No! The Solar Controller is uniquely optimized to run the least amount of time possible; using the least amount of electricity possible. Since the ambient temperature continues to drop after sunset, the fan only needs to run in short intervals. And since it uses a DC powered motor, the amount of actual energy drain is minimal. The additional electricity required will cost less than $5 per year.

If you find that you are interested in this new product please contact us to set up an appointment for installation.