Please explain SEER and AFUE ratings.


The Seasonal Energy Efficiency Ratio (SEER) measures air conditioning and heat pump cooling efficiency, which is calculated by the cooling output for a typical cooling season divided by the total electric energy input during the same time frame. A higher SEER rating means greater energy efficiency.

The Annual Fuel Utilization Efficiency (AFUE) is a measure of a  gas furnace’s efficiency in converting fuel to energy. Amount of energy (%) you get out of one cubic foot of natural gas. A higher AFUE rating means greater energy efficiency.

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