Attic Temperature Differential Winter

Is there any rule of thumb for attic temps compared to outside temp.

Attic temperature differential winter. The white roof lowered the attic temperature by about 20 f. If your attic soars above 100 degrees and reaches the 150 mark its time to consult. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. Adjustable thermostat and humidistat control has 10 amps 120 volts ac.

My house is a 1979 basic ranch style house and ive always had bad ice problems. Thermostat setting adjusts from 60 120 degrees f normal settings are 85 110 degrees f. Attic ventilation i am providing here a bit of background information because this is a very canadian problem and mostly unknown to people in less extreme climates such as e g europe. The summers are very warm and the winters cold.

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. As snow accumulates it alters the temperature profile of an attic and roof surface. The temperature difference between summer and winter are here about 70 c. Now if the ridge vent is only partial or if the attic air temperature is excessive 20 degrees higher than the outside air fans may prove beneficial pick the right fan.

In south florida the typically daytime temperature might be 92 degrees to 95 degrees and the attic temperature might vary from 120 degrees for a tile roof to 140 degrees for a dark color shingle roof. The cooling load for a home air conditioner depends on the difference in temperature between the inside and outside air and reduction of attic temperatures from 155 degrees to 105 degrees f will result in a significant reduction in cooling load. It removes excess heat from an attic in summer and humidity in winter and allows equalization of inside and outside attic temperatures dual humidity control.