Most attic fans operate with a thermostat that automatically turns the fan on and off based on a temperature the homeowner sets.
Proper attic fan temperature setting.
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.
In particularly hot climates set the temperature higher to keep the fan from running for extended periods of time.
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.
I ve seen recommended settings to be any where from 95 degrees to 105 degrees.
It essentially pulls that cooled air through cracks and crevices in the attic floor and also through holes that allow for wires and pipes.
The range on the fan is from 50 to 130 degrees f.
Most manufacturers and contractors recommend a temperature setting between 100 and 110 degrees fahrenheit.
Of course some environments are much hotter than others so this will be the perfect time to measure out how warm your attic will get during the most heated of seasons.
When it comes to adjusting the thermostat of your attic s fan it s best to adjust it to approximately 90 to 95 degrees.
As mentioned earlier adjustable thermostats give you the ability to simply set a dial and forget about the fan.
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.
Attic ventilators generally turn on between 90 and 110 degrees fahrenheit.
If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals.
The reason is that attic fans depressurize attics and can rob air conditioned air from the main body of the house greatly decreasing efficiency.