What Temperature Should Your Attic Fan Be Set 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. When it comes to an attic fans temperature setting its best to adjust it to anywhere from 90 to 110 degrees Fahrenheit.
If your attic soars above 100 degrees and reaches the 150 mark its time to consult. Moreover what temp should attic fan be set at in summer time. If its 90 degrees outside the attic temperatures shouldnt exceed 110 according to home inspector Jamison Brown of AmeriSpec Home Inspection.
As was mentioned earlier an attics temperature should never exceed 130F and its really only in the summertime when this is even a possibility.
However it is important to set the fan hotter than the ambient outside temperature to avoid burning out the fans motor. In winter the humidistat operates the attic fan when the relative humidity exceeds a preset degree normally 40 to 50. The reason is that attic fans depressurize attics and can rob air conditioned air from the main body of the house greatly decreasing efficiency. When there isnt proper ventilation in your attic then hot air can become trapped between the insulation and the roof turning your attic into a large oven.
