TY - BOOK ID - 125415970 TI - Estimating the heating seasonal operating cost of residential hybrid heat pump systems, including units retrofitted to oil, gas and electric furnaces AU - Domanski, Peter. AU - Kelly, George E. AU - United States. PY - 1980 PB - Gaithersburg, MD : U.S. Dept. of Commerce, National Institute of Standards and Technology, DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:125415970 AB - ER -