Internal Gains

Anything producing heat as a waste product affects the heating and cooling loads within the house. The waste heat causes an increase in the cooling energy consumption, and a decrease in the heating energy consumption. The Home Energy Saver accounts for internal gains by passing information about internal heat loads to the DOE-2 building simulation engine. Information about the number of occupants and the energy consumption for lighting and gas and electric appliances (including the water heater) for all equipment located within the conditioned space is sent as internal gains to DOE-2.

Energy use fractions (fraction of heat assumed to be an internal gain) for the large appliances are based on values used for the Building America Research Benchmark (Hendron and Engebrecht 2009): 

Other internal gain assumptions are as follows: