Running Cost
Estimate what your system costs to run using the energy rate you enter (no stored tariffs): AC and heat-pump running cost from capacity and efficiency, furnace cost by fuel, electric-vs-gas heat, and thermostat-setback savings.
AC Running CostEstimate what your air conditioner costs to run per hour and per season from its BTU capacity, EER efficiency and your own $/kWh electricity rate.Heat-Pump Running CostWork out heat-pump running cost from capacity, COP and your electricity rate. See the kW draw, kWh used and dollar cost for any number of run hours.Furnace Running CostEstimate furnace running cost from heating output, AFUE efficiency and your own fuel price — natural gas per therm, or propane and heating oil per gallon.Electric vs Gas HeatCompare electric heat-pump heating against a gas furnace in delivered dollars per MMBTU, using your utility rates, the AFUE and the heat-pump COP.Thermostat Setback SavingsEstimate the seasonal savings from setting your thermostat back at night or while away, from your annual heating or cooling bill and the setback depth.
Every Running Cost tool is calculated server-side — visible immediately — with its formula, a worked example and a reference table. Background reading is in the guides.