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SEER or seasonal energy efficiency ratio provides information about HVAC efficiency. In addition to adequate cooling capacity, a unit should be efficient. A more efficient unit will cost less to operate. In fact, many of the new energy efficient air conditioning units have operating costs that are half those of older, less efficient models.

SEER indicates how much cooling is provided per watt of electricity on a seasonal basis. The higher a unit's SEER, the higher its efficiency. Using SEER, the consumer can easily compare the efficiency of two units. For example, a unit with a SEER of 10 will be twice as efficient as one with a rating of 5, and should cost approximately half as much to operate. Manufacturers are required by law to publish energy efficiency ratings and estimated annual operating costs of their residential air-conditioning systems.