@misc{1181916,
  author = {Peter Domanski and George E Kelly},
  title = {Estimating the heating seasonal operating cost of residential hybrid heat pump systems, including units retrofitted to oil, gas and electric furnaces:},
  year = {1980},
  month = {1980-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.80-2090},
  language = {en},
}