Net annual heat loss factor method for estimating heat requirements of buildings.

Presents method for estimating the heat requirements of buildings. The method is based on the ASHRAE degree day method with modifications to take into account a) solar radiation incident on a building surface, b) variation of solar energy gained through windows, c) variation of air infiltration withwind speed and inside-outside temperature difference and d) heat generated by inside activity, such as lights, people etc.< Gives sample calculation for a house and compares with calculation by ASHRAE method.