Room air conditioners: Annual Operating Cost

This is an estimate. Operating cost is an estimate, computed from each model's measured annual energy use at the EIA U.S. national-average residential electricity rate (18.56 ¢/kWh, March 2026). Your actual cost depends on your local utility rate and how you use the appliance. How we compute this.

Across 395 ENERGY STAR certified room air conditioners surveyed, the median unit consumes approximately 510 kilowatt-hours annually and costs an estimated $95 per year to operate. Annual running costs across the field range from roughly $51 to $389, calculated using each model's measured energy consumption and the U.S. national-average residential electricity rate. This standardized calculation basis allows for direct comparison across models independent of regional rate variations or manufacturer claims.

Operating cost represents only one factor in the selection process. Purchase price, cooling capacity, and available features also significantly influence the overall value and suitability of a room air conditioner. However, differences in energy efficiency can produce meaningful savings over an appliance's operational lifespan. Actual operating expenses will vary based on local electricity rates and individual usage patterns, making this specification-and-cost comparison a reference tool rather than a substitute for personalized purchasing or installation guidance.

How we estimate operating cost

Operating cost is an estimate, computed from each model's measured annual energy use at the EIA U.S. national-average residential electricity rate (18.56 ¢/kWh, March 2026). Your actual cost depends on your local utility rate and how you use the appliance.

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