Attic Fan Temperature Setting

Most attic fans operate with a thermostat that automatically turns the fan on and off based on a temperature the homeowner sets.

Attic fan temperature setting.

Likewise adjustable thermostats will shut the fan off. Most manufacturers and contractors recommend a temperature setting between 100 and 110 degrees fahrenheit. Attic ventilators generally turn on between 90 and 110 degrees fahrenheit. What temperature should attic fan be set at.

If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals. When it comes to adjusting the thermostat of your attic s fan it s best to adjust it to approximately 90 to 95 degrees. Generally you need to set only one temperature for the thermostat. But if your attic rarely breaks 100 then i guess that s the temp to set it at.

Ideally your attic space will stay in the same temperature range 105 115 degrees and the only true way to tell is to stick a thermometer into your attic overnight and check the reading every couple hours. That s why we upped the insulation in the attic floor. This temperature can be anywhere between 80 to 120 degree fahrenheit. I think the normal average setting is 110 or higher if you are in a hot climate.

That said attic fans are not the best choice for cooling attics especially if you have central air conditioning. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. When the temperature drops below that set temperature it is again switched off. Most manufacturers recommend setting your attic fan thermostat between 105 115 degrees and monitoring how often and how long the fan runs to adjust the setting for your home.

I doubt you even need an attic fan if that s the case. In particularly hot climates set the temperature higher to keep the fan from running for extended periods of time. When that temperature is reached or exceeded the thermostat ensures that the attic fan is switched on. When the temperature within the attic reaches a set point the fan will turn on and start venting the heated air cooling the attic space.

The reason is that attic fans depressurize attics and can rob air conditioned air from the main body of the house greatly decreasing efficiency.