HSPF (Heating Seasonal Performance Factor)
HSPF is the measurement used to gauge the heating efficiency of heat pumps. (A heat pump’s cooling efficiency is measured by its SEER). The higher the HSPF number, the greater the efficiency and cost-savings.HSPF is a seasonal measure (meaning that it takes into account the fact that the heat pumps rarely for as long as is optimal during Spring and Fall). HSPF can be thought of as the “averaged factor” for an entire heating season. HSPF is calculated by taking the total annual heating requirements, including all energy inputs (defrost and back-up heating energy included) divided by the total electric power used. The industry standard rating system compares BTUs of heat output to watts of electrical energy consumed. There are 3.4 BTUs per watt of electricity; an HSPF of 6.8 corresponds roughly with an averaged factor of 2. Heat pumps manufactured after 2005 are required to have an HSPF of at least 7.7. The most efficient heat pumps currently have an HSPF of 10.
New units are coming out by the end of the year that claim an HSPF near 20! Raleigh Heating and Air will keep you informed about this and all new products for your home comfort needs. If you have any questions please call us any time at 919-878-0008.