SEER stands for Seasonal Energy Efficiency Ratio. It's
a number (between 8-23) that describes how efficient an air-conditioning
system works. A higher SEER means higher efficiency and lower energy
bills.
SEER is calculated by dividing the amount of cooling supplied by the air
conditioner or heat pump (Btu's per hour) by the power (watts) used by
the cooling equipment under a specific set of seasonal conditions.
These ratings are determined in a laboratory where the exact set of
indoor and outdoor conditions-specified by the US Department of
Energy-are guaranteed to exist. Because each piece of cooling equipment
is evaluated using the exact same conditions, the rating can be used in
comparing the performance of equipment from different manufacturers.
Higher ratings can be achieved by manufacturers who use newer or better
technology in their equipment.
That's why these ratings have a big influence on initial equipment costs
and also why SEER has become an important part of manufacturers and HVAC
marketing programs.
In the United States, all air conditioners sold on or after January 1,
2006 are required to have a SEER rating of at least 13. Window
air-conditioners that are mounted in windows are not affected by this
law.
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