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Describes a study to determine savings in electric energy use and demand for a heat pump air-distribution system when it is located inside a building's conditioned space versus an identical system located in the attic and crawlspace. The comparison was made in a two-storey apartment building with two identically-sized apartments on both the first and second floors. Data obtained show that the 'inside' test apartments used 33.8% less energy for heat and 71.4% less energy for cooling, and saved 59% demand at the energy supply company's winter peak in January. Compressor run time was 38% less than the control units.

KEYWORDS: Electricity consumption, energy conservation, heat pumps, USA, measuring, performance, flats, attics, crawl spaces, heating, cooling, indoor, outdoor, air distribution.