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Air Conditioner Running Cost

Estimate what running a window or portable AC costs monthly.

About Air Conditioner Running Cost

The unit's wattage is multiplied by run hours and divided by 1,000 to get kilowatt-hours, which times the rate gives cost. AC is often the largest summer electric load, so its true cost changes choices about settings, size and insulation.

Formula

Air Conditioner Running Cost

kWh = watts x hours / 1000; daily cost = kWh x rate

kWh
Kilowatt-hour, the unit utilities bill electricity in

Worked example

With the default values below, Air Conditioner Running Cost returns Monthly Cost of $43.20. Change any input above and every figure here is recalculated in your browser.

Inputs used

Powerminimum 0 W
1,200 W
Hours per dayminimum 0
8
Electricity rateminimum 0 $/kWh
0.15 $/kWh

Results

Daily Cost
$1.44
Monthly Cost
$43.20
Annual Cost
$525.60

Step by step

  1. 1Values used
  2. 2Air Conditioner Running Cost
  3. 3Monthly Cost= 43.20
  4. 4Daily Cost= 1.44
  5. 5Annual Cost= 525.60

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Air Conditioner Running Cost calculated?

kWh = watts x hours / 1000; daily cost = kWh x rate The unit's wattage is multiplied by run hours and divided by 1,000 to get kilowatt-hours, which times the rate gives cost.

Why does Air Conditioner Running Cost matter?

AC is often the largest summer electric load, so its true cost changes choices about settings, size and insulation.

What values do I need to enter?

This calculator takes 3 inputs: Power, Hours per day, Electricity rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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