TY JOUR TI METHODOLOGY FOR EVALUATING THE PROJECTS OF HEATING SYSTEMS FOR INDIVIDUAL RESIDENTIAL HOUSES KW heating system KW residential building KW energy efficiency KW energy saving KW renewable energy sources KW heat pump JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Galyuzhin, S.D. AU Lobikova, N.V. AU Lobikova, O.M. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov