How does the Air Conditioner Energy Cost Calculator work?
The calculator multiplies AC power by scheduled operating time and duty cycle to estimate kWh, then applies your electricity rate. For a general non-cycling device estimate, use the Electricity Cost Calculator.
What should you use for AC wattage and duty cycle?
Use measured input power when available or a reasonable rated-power estimate. Duty cycle is the share of scheduled time the unit is modeled as actively drawing the entered power. The Appliance Energy Cost Calculator uses the same concept for other cycling equipment.
What does monthly AC kWh mean?
Monthly kWh is the modeled cooling electricity use for the period. The result also shows daily cost and an annualized cost at the same usage pattern. To see how cooling fits into a full household utility scenario, use the Home Energy Cost Calculator.
Why can real AC energy use vary?
Outdoor temperature, humidity, thermostat settings, insulation, duct losses, equipment sizing, efficiency rating, maintenance and variable-speed operation all affect real use. Compare different schedules and then price known kWh with the kWh Cost Calculator; if you are evaluating electric heating too, see the Heating Cost Calculator.
Frequently asked questions about Air Conditioner Energy Cost
Duty cycle is the percentage of scheduled time that the calculator assumes the AC is drawing the entered power.
No. Power can vary by compressor stage, fan speed, outdoor conditions and equipment design.
Yes, if you have a reasonable wattage and duty-cycle estimate for the unit.
Yes as a simplified input-power model, but central systems can have multiple components and variable operation.
Not directly. This tool uses electrical input power and operating time rather than converting from cooling capacity and efficiency ratings.
No. It estimates the energy charge from modeled AC kWh.
It extends the entered usage pattern across a year, while real cooling use is highly seasonal.
Yes. Use the same hours, days, duty cycle and electricity rate while changing the power input to compare modeled energy cost.
Sources and methodology
The calculator uses the transparent formula described on this page and the values you enter. These authoritative U.S. resources provide context for electricity, home energy, solar, efficiency or safety topics related to this tool.