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Attic Temperature


Old 07-22-20, 04:11 PM
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Attic Temperature

Weather conditions are clear sky, sunny and 95 degrees at 3:00 PM. In a well insulated and vented attic, what temperature should I expect to measure?
Old 07-22-20, 04:15 PM
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Depends on the color and type of shingle on your roof. The shingles themselves are maybe 130-150F. The attic could easily be 120-140F. As long as the attic floor is well insulated, it really doesnt matter what temperature it is. The temperature will also vary depending on where you test it.
Old 07-24-20, 05:49 PM
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There is no ideal attic temperature. The idea is to reduce attic air temperature with ventilation as close as practical to outside air temperate to reduce room/house AC heat load. It is great way to improve AC performance and reduce operating costs.

With my attic ventilation fan running attic air is 5F to 7F above outside at 90F. Fan is activated by regular room AC thermostat in attic with set at 85F with 2 degree delta-T.

Here in evening /night outside temperature is typically 80F or below so fan does not run all night. On hot nights in summer may raise it to activate at 90F.

Many old attic ventilation fans did not active until well above 100F. What a waste.
ferd42 voted this post useful.

Last edited by doughess; 07-24-20 at 06:06 PM.

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