TY - RPRT TI - A proposed methodology for rating air-source heat pumps that heat, cool, and provide domestic water heating AU - Dougherty, Brian P PY - 1989 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 89-4154 DO - 10.6028/NIST.IR.89-4154 ER -