The required rate of heat removal.

The computation of the quantity of cooling and heating (in British Thermal Units-BTUs) an air conditioning and heating system must produce for indoor comfort. The load is influenced by many factors: climate, square footage of conditioned area, orientation and layout of the building, number of human occupants, room count and dimensions, window and door count and characteristics, insulation quantity and quality, and more.

Studies to determine the heating or cooling requirements of a home or building.