TY - GEN AU - Domanski, Peter AU - Kelly, George E C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1980-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.80-2090 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1980 TI - Estimating the heating seasonal operating cost of residential hybrid heat pump systems, including units retrofitted to oil, gas and electric furnaces: ER -