We believe customers are able to make better, informed choices and the ultimate empowerment is to provide a sample of web links to other sources for the research stage:
Air-Conditioning, Heating and Refrigeration Institute - AHRI
AHRI is an industry association and also responsible to test and issue the AFUE (Annual Fuel Utilitization Efficiency) rating on furnaces. AFUE rating, NOT Combustion Efficiency rating, is the only acceptable standard for furnace fuel efficiency comparison. AHRI is therefore the source where consumers can find the independent, comparative data.
ENERGY STAR - USA
ENERGY STAR is a joint Program of the Department of Environmental Protection Agency and the US Department of Energy. A reliable source of information.
American Council for an Energy-Efficient Economy - ACEEE
The official web site of American Council for an Energy-Efficient Economy, provides a wealth of information on a range of issues, including the HVAC equipments of the Residential Sector.