TY - GEN AU - Parken, Walter H AU - Kelly, George E AU - Didion, David A C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1980-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.80-2002 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1980 TI - Methods of testing, rating and estimating the heating seasonal performance of heat pumps: ER -