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Efficiency Ratings of HVAC Equipment
Federal law mandates a minimum efficiency of 13 SEER for unitary equipment of less than 65,000 Btuh capacity. The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommends 10 EER for equipment between 65,000 and 135,000 Btuh. ASHRAE standard 90.1 recommends other efficiencies for larger equipment. It is often cost effective to pay for more efficient equipment. For example, upgrading from a 13 SEER to a 14 will reduce cooling costs by about 7 percent. Upgrading from a 13 to a 15 reduces cooling costs by about 13 percent.
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