The Home Energy Saver web site models the following heating and cooling equipment types: *Default Efficiency is AFUE unless otherwise indicated. See the Equipment Efficiencies Page for information on how efficiencies are calculated from year purchased. ** Capacity for this equipment type is automatically calculated in the DOE-2.1 model. *** Usage for this equipment type is calculated in the DOE-2.1 model, based on user-specified thermostat settings and schedule (see below) DOE-2.1 models both
electricity
and other fuel usage for equipment types with multiple fuels (e.g.
Central Gas
Furnaces, which use natural gas for heating and electricity use by the
air-handler fan). Air-handler fan efficacy is assumed to be 0.5
watts/cfm for standard equipment with PSC motors and 0.375 watts/cfm for
equipment with ECM motors (ECM motors are assumed in these cases: SEER
> 13.5, HSPF > 8.5, or AFUE > 90%). For those equipment types modeled in DOE-2, the equipment characteristics are input to the DOE-2 model. Energy consumption in million BTUs is returned from DOE-2 and converted to the units in which the consumer would purchase the fuel, using the fuel-specific conversion factors found in the table below
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Calculation Methodology > Calculation of Energy Consumption > Legacy > Heating and Cooling Calculation > Heating and Cooling Equipment >