Home systems
Home energy cost calculators
Estimate the electricity cost of major household loads with transparent inputs and state-level residential electricity prices.
Water heatingWater-heater electricity costModel the thermal load from daily hot-water use and compare electric resistance, heat-pump, and tankless assumptions.PoolsPool-pump electricity costPrice single-speed and multi-speed operating schedules with seasonal runtime and state electricity rates.Heating & coolingHVAC operating costUse capacity, efficiency, cycling, and runtime to estimate heating and cooling electricity cost.AppliancesCommon appliance costConvert watts and runtime into daily, monthly, and annual electricity cost.
Why separate the models?
A 1,500-watt space heater can be modeled directly from watts and runtime. Water heating depends on how much water is heated and by how many degrees. Pool pumps can run at multiple programmed speeds. HVAC equipment uses capacity and efficiency ratings. PowerCostAtlas keeps those assumptions visible instead of forcing every device into one generic formula.