TY - GEN AU - Kao, James Y AU - Mulroy, William J AU - Didion, David A C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1987-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.87-3528 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1987 TI - Field performance of three residential heat pumps in the heating mode: ER -