Home Attic Temperature

If it s 90 degrees outside the attic temperatures shouldn t exceed 110 according to home inspector jamison brown of amerispec home inspection services in poquoson.

Home attic temperature. Defeat attic heat the temperature in your attic can reach 150 degrees on a hot summer day a situation that if left unchecked can drive up cooling costs by as much as 40 percent. Install electric ventilators and attic fans which remove hot air from an attic. If your attic has less than r 22 insulation 7 inches of fiberglass or rock wool or 6 inches of cellulose you should add more. A standard powered exhaust vent turns on when the temperature inside the attic reaches a pre set limit and runs until the temperature drops.

This prevents hot air from seeping into your home and driving up the temperature in the living space which reduces the load on your air conditioner. If your attic soars above 100 degrees and reaches the 150 mark its time to consult. They have thermostats that turn the fan on at a recommended preset temperature of 100 110 degrees. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures.

A check the temperature an hour before sunrise. 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. Attic ventilation fans help cool air your attic by pushing out the stifling hot air from inside the attic and bringing in cool air from outside. What should the attic temperature be relative to the outside and house temperatures assuming a new supposedly well insulated house.