June 18, 2009
ASSUME MULTI-SPLIT SYSTEM WITH 22,000 BTUH HEATING AVAILABLE IN UNIT WITH AN AVERAGE OF 13,500 BTUH LOAD.
TOTAL BTU’S CONSUMED PER MONTH IS:
13,500 X 30 DAYS X 24HRS/DAY = 97.2 THERMS.
GAS HEATING COST PER MONTH IS:
97.2 THERMS/0.80 EFF. X $1.06962/THERM = $129.96/MO.
SERVICE CHARGE, PER MONTH = $6.50
TOTAL GAS CHARGE = $135.96/MO.
97.2 THERMS = 2,848 kWh
COP = 2.70 AT 17◦F AMBIENT
ENERGY CHARGE IS $0.063282/kWh/2.70 COP = $66.75/MO.
SERVICE CHARGE, PER MONTH = $4.00
TOTAL ELECTRIC CHARGE = $70.75/MO.
MULTI SPLIT HEATING COST IS 52% OF GAS HEATING. 48% SAVINGS