TY JOUR TI MODEL OF THE COST OF HEAT PUMPS KW energy saving KW thermal energy disposal KW heat pump KW one-time costs JO Modern Technologies and Scientific and Technological Progress AU Ivshina, N.A. AU Kuz'min, S.I. PY 2020 IS 2020 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»