Attic Temperature Differential

The white roof lowered the attic temperature by about 20 f.

Attic temperature differential. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. R value from outdoors to attic 1 u. If you are keeping your house at 78f in 100f ambient and the attic is 125f then you have a 47f temp gradient. If you do a good job with attic fans and get the attic temp down to 5f over ambinet 105f then you are dealing with a 27f temperature gradient.

What should the attic temperature be relative to the outside and house temperatures assuming a new supposedly well insulated house. If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals. 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. With 60 f in the eave space on the coldest day there is no risk of pipes freezing and minimal waste heat loss from the heating system ducts.

Temperature difference 35 71 41 67 70 0. January 8 2010 5 15pm text size.