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• Domanski, P. A,; Kelly, G. E.
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  Estimating the Heating Seasonal Operating Cost of Residential Hybrid Heat Pump Systems, Including Units Retrofitted to Oil, Gas and Electric Furnaces.
  National Bureau of Standards, Washington, DC
  NBSIR 80-2090
  Department of Energy, Washington, DC, NBSIR 80-2090
  July 1980