Asked in
Heating Ventilating and Air Conditioning
Math and Arithmetic

How many btus will heat a 400 sq ft area at 75 degrees effectively?


User Avatar
Wiki User
January 25, 2008 11:25PM

Depending on your load the answer is different. (i.e where you are in the country)

In the deep south, its approximately 30 - 35 Btu's per square foot.

In the upper states, its approximately 50 - 60 Btu's per square foot.

So 5000 BTU's will be good for 166 sq. ft in the south and 100 sq ft in the north.