Home energy & efficiency
Air Conditioner Cost Calculator
Estimate the running cost of a window or portable A/C unit by its BTU rating and typical daily usage.
1. Unit & Usage
2. Running Cost
kWh × rateMONTHLY COST
$—
SEASONAL COST (3 summer months)
$—
Circuit note: larger window units (12,000 BTU+) often need a dedicated 20A circuit. Check your unit's nameplate amperage against our Breaker Size Calculator before plugging into a shared circuit.
Tips for lower running cost
- Size the unit to the room — an oversized unit short-cycles and runs less efficiently, an undersized one runs constantly and still can't keep up.
- A programmable thermostat or timer avoids cooling an empty room.
- Keep the filter clean — a clogged filter makes the compressor work harder for the same cooling.
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