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SEER (seasonal energy efficiency ratio) measures how efficiently a residential central cooling system (air conditioner or heat pump) will operate over an entire cooling season, as opposed to a single outdoor temperature. A higher SEER reflects a more efficient cooling system. SEER is calculated based on the total amount of cooling (in Btu) the system will provide over the entire season divided by the total number of watt-hours it will consume:
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seasonal Btu of cooling |
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SEER = |
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seasonal watt-hours used |
By federal law, every central split cooling system manufactured or sold in the Canada today must have a seasonal energy efficiency ratio of at least 13.0.
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