
SEER
Seasonal Energy Efficiency Ratio — a measure of cooling efficiency over a typical cooling season.
AFUE
Annual Fuel Utilization Efficiency — measures a furnace's efficiency in converting fuel to energy.
HSPF
Heating Seasonal Performance Factor — measures the efficiency of heat pumps.
BTU
British Thermal Unit — the amount of heat required to raise one pound of water by one degree Fahrenheit.
Ton
A unit of cooling capacity equal to 12,000 BTUs per hour.
Refrigerant
The fluid in an AC system that absorbs and releases heat to cool your home.
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