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Kwh
A kilowatt hour (kwh) is the standard unit of electricity that your electric meter uses to measure how much power you consume. You should be able to determine how much a kilowatt hour costs where you live by consulting your utility bill.
BTU or BTU/hr
A British Thermal Unit is a measure of the amount of heat or cooling energy that a furnace or air conditioner provides. Technically, a BTU is the amount of energy required to change the temperature of one pound of water by 1 degree F.
EER
The Energy Efficiency Ratio (EER) is the ratio of an air conditioner’s cooling capacity, measured in BTUs/hour, to the total electrical input in watts.
AFUE
Annual Fuel Utilization Efficiency is a measure of how efficiently a furnace or boiler converts fuel or electricity into heat. It is expressed as the ratio of the total amount of heat that the unit generates to the total amount of energy it consumes.
Information about other energy-related terms is available at the Department of Energy’s Energy Savers site.
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