TY JOUR TI EVALUATION OF THE EFFICIENCY OF HEAT PUMPS FOR HEAT-CONSUMING BUILDING SYSTEM KW energy saving KW heat energy utilization KW heat pump KW reduced costs KW heat consuming systems. JO Modern Technologies and Scientific and Technological Progress AU Ivshina, N.A. AU Kuzmin, S.I. PY 2019 IS 2019 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»