How to use the Air Conditioner Energy Cost Calculator
The Formula
Monthly cost = (watts × hours/day × days ÷ 1,000) × $/kWh. Duty cycle varies—use average watts if the compressor cycles.
Practical Example
Oversized or inefficient units cost more. Compare SEER ratings when replacing equipment.
About Air Conditioner Energy Cost Calculator
AC cost formula
Monthly cost = (watts × hours/day × days ÷ 1,000) × $/kWh. Duty cycle varies—use average watts if the compressor cycles.
SEER and sizing
Oversized or inefficient units cost more. Compare SEER ratings when replacing equipment.
Frequently asked questions
Q: Should I use rated BTU? A: Use measured or estimated watts; BTU/h ÷ 3.412 ≈ watts for rough conversion.