Energy efficiency in furnaces is measured by the annual fuel utilization efficiency (AFUE) rating. This is a seasonal measure of fuel efficiency only. It does not include the electrical energy required to operate controls, fans or pumps.
The higher the AFUE rating, the more efficient the unit is.
A furnace’s voluntary EnerGuide label displays the model type and AFUE rating. It also uses a pointer to show where that rating falls on a scale of energy efficiency for similar models. Use the AFUE rating value and EnerGuide scale to compare furnaces.
The EnerGuide label may appear beside the ENERGY STAR® symbol for certified models.
EnerGuide label for a gas or a propane furnace
EnerGuide label for a gas or a propane furnace with a high efficiency motor
EnerGuide label for an oil furnace
EnerGuide label for an oil furnace with a high efficiency motor
The ENERGY STAR name and symbol are trademarks registered in Canada by the United States Environmental Protection Agency and are administered and promoted by Natural Resources Canada.
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