They have thermostats that turn the fan.
Control attic temptures.
The insulation will trap heat instead of letting the heat dissipate to other parts of the home.
The white roof lowered the attic temperature by about 20 f.
How can you combat the excessive heat in your attic.
To head off these problems consider these options for bringing your attic s temperature down.
One is the use of attic fans.
Hot summer weather poses the opposite problem for maintaining recommended attic temperatures.
Alternatively install passive vents such as gable soffit and ridge vents which.
Low slope roofs need less and high slope roofs over 45 degrees need another 20 percent or so because there s more air to move.
Quelch the heat wave.
For a general estimate in homes with ceiling insulation and vapor barriers figure about one square foot of vent per 300 square feet of attic floor.
Temperature control and moisture control are the major reasons for providing attic ventilation.
Step 1 install insulation under the attic floors to keep the attic from getting too hot or too cold.
Install electric ventilators and attic fans which remove hot air from an attic.
Cold outdoor temperatures especially below freezing can wear on your furnace.
These images came from a presentation danny parker gave pdf on fsec s cool roof research the third graph shows attic temperatures from the middle of the attic for several different types of roofing as well as a sealed attic.
Ideal attic temperature and humidity settings cold outdoor temperatures affect attics.