Hang an outdoor thermometer in your attic making sure its range reaches at least 130 degrees fahrenheit.
Attic temp with thermostat.
Likewise adjustable thermostats will shut the fan off.
Most attic fans operate with a thermostat that automatically turns the fan on and off based on a temperature the homeowner sets.
Hang pencil and paper next to the thermometer and record the outdoor and attic temperatures.
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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.
Most manufacturers and contractors recommend a temperature setting between 100 and 110 degrees fahrenheit.
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Hot summer weather poses the opposite problem for maintaining recommended attic temperatures.
When the temperature drops below that set temperature it is again switched off.
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Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures.
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In particularly hot climates set the temperature higher to keep the fan from running for extended periods of time.
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.
This temperature can be anywhere between 80 to 120 degree fahrenheit.
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When that temperature is reached or exceeded the thermostat ensures that the attic fan is switched on.