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The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
Air-conditioner sizes are often given as "tons" of cooling, where 1 ton of cooling equals 12,000 BTU/h (3.5 kW). 1 ton of cooling equals the amount of power that needs to be applied continuously over a 24-hour period to melt 1 ton of ice. The annual cost of electric energy consumed by an air conditioner may be calculated as follows:
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In the 1930s a seventh-floor addition was constructed on the roof and air-conditioning was installed throughout the building. Where necessary, extensive remodeling of original corridors was undertaken. [2] In 1999 the U.S. General Services Administration initiated a demonstration "First Impressions" project in the lobby and on the building's ...
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