Attic Ventilation Fan Temperature

That said attic fans are not the best choice for cooling attics especially if you have central air conditioning.

Attic ventilation fan temperature.

Most manufacturers and contractors recommend a temperature setting between 100 and 110 degrees fahrenheit. The reason is that attic fans depressurize attics and can rob air conditioned air from the main body of the house greatly decreasing efficiency. This prevents snow from melting on your roof and freezing when it hits the cold gutter. The fans cool the attic equalizing the temperature between the attic and outside of the home.

Attic ventilators generally turn on between 90 and 110 degrees fahrenheit. Calculations indicate that on a july day in texas a ventilation rate of one air change per minute for a typical attic using 95 degree f air will lower the peak attic temperature to about 101 degrees f. 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.

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