AC and HVAC Running Cost
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Comfort cooling often becomes the silent largest load. Enter tons, EER or direct kW, hours and bill rate to see what the AC schedule costs each month.
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The formula we use
kW = TR * 3.517 / EER (if kW not given)
monthlyKWh = kW*hours*days
cost = monthlyKWh * rate
- Direct kW input overrides the TR and EER estimate.
- No part-load, setpoint, weather or maintenance modelling.
- For chiller plants, pumps and cooling towers may need separate metering.
Common questions
Should I enter EER or direct kW?
If measured input kW is available, use direct kW. Otherwise the calculator estimates kW from TR and EER.
What does EER mean here?
EER is cooling output divided by electrical input in W/W. Edit the example to match your equipment.
Does this model part-load operation?
No. It uses the entered kW and hours as a screen. Chillers, VRF and inverter ACs need operating data for precision.