HSPF (Heating Seasonal Performance Factor) is a term used in the heating and cooling industry. HSPF is specifically used to measure the efficiency of air source heat pumps. The efficiency of air conditioners are often rated by the HSPF as defined by the Air Conditioning, Heating, and Refrigeration Institute in its standard 210/240 Performance Rati...
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http://en.wikipedia.org/wiki/HSPF
heating seasonal performance factor
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http://www.translationdirectory.com/glossaries/glossary136.htm
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