**Energy Efficiency Rating (EER)**

Cooling efficiency rating for room air conditioners. The ratio of the rated cooling capacity in Btu per hour divided by the amount of electrical power used in kilowatt-hours.

The higher the EER number, the greater the efficiency.

**Seasonal Energy Efficiency Rating (SEER)**

Cooling efficiency rating for central air conditioners and heat pumps. SEER is determined by the total cooling of an air conditioner or heat pump in Btu during its normal usage period for cooling divided by the total electrical energy input in kilowatt-hours during the same period.

The higher the SEER number, the greater the efficiency.

**Annual Fuel Utilization Efficiency (AFUE)**

Tells you how efficiently a furnace converts fuel (gas or oil) to heat. For example, an AFUE of 85% means that 85% of the fuel is used to heat your home, and the other 15% goes up the chimney.

The higher the efficiency, the lower the operating cost. Old furnaces might have an AFUE rating as low as 60%.

Mid-efficiency ratings are approximately 80%.

High-efficiency ratings are 90% or higher.

Maximum furnace efficiency available is approximately 96.6%.

The higher the AFUE number, the greater the efficiency.

**Heating Seasonal Performance Factor (HSPF)**

Heating efficiency of a heat pump. HSPF is determined by the total heating of a heat pump in Btu during its normal usage period for heating divided by the total electrical energy input in kilowatt-hours during the same period.

The higher the HSPF rating, the greater the efficiency.

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