Home > Products > Heating & Cooling > Furnaces > Key Product Criteria

Furnaces Key Product Criteria

Equipment Specification
Gas Furnaces Key Product Criteria Rating of 90% AFUE* or greater
Oil Furnaces Key Product Criteria Rating of 83% AFUE or greater

Note: the ENERGY STAR specification for furnaces is intended for models installed and used in residences

Furnace:
A heating unit with a heat input rate of less than 225,000 Btu per hour whose function is the combustion of fossil fuel for space heating with forced hot air. Unit must include burner(s), heat exchanger(s), blower(s) and connections to heating ducts. A heating unit that meets this definition and also provides hot water for domestic or other use may be considered a furnace for purposes of this agreement.
AFUE:
The Annual Fuel Utilization Efficiency (AFUE) measures the amount of fuel converted to space heat in proportion to the amount of fuel entering the furnace. This is commonly expressed as a percentage. For purposes of this agreement, the efficiency of a furnace shall be measured using AFUE. Test procedures have been developed to test AFUE by the Department of Energy (DOE). These procedures are specified in 10 Code of Federal Regulations part 430, Appendix N.