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Room Cooling Cost

Estimate cooling cost from room size, watts per square foot and usage.

About Room Cooling Cost

Room area times a watts-per-square-foot estimate gives the cooling load, which is then priced by run time and rate. Scaling cooling power to room size shows why oversized units waste energy and why sealing a room cuts the bill.

Formula

Room Cooling Cost

Power = room sq ft x watts per sq ft; cost = kW x hours x rate

watts per sq ft
Approximate cooling load per square foot of room

Worked example

With the default values below, Room Cooling Cost returns Estimated Power of 1,000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Room sizeminimum 0 sq ft
250 sq ft
Watts per sq ftminimum 0 W
4 W
Hours per dayminimum 0
6
Electricity rateminimum 0 $/kWh
0.15 $/kWh

Results

Estimated Power
1,000 W
Monthly Cost
$27.00
Annual Cost
$328.50

Step by step

  1. 1Values used
  2. 2Room Cooling Cost
  3. 3Estimated Power= 1,000 W
  4. 4Monthly Cost= 27.00
  5. 5Annual Cost= 328.50

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax 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 Room Cooling Cost calculated?

Power = room sq ft x watts per sq ft; cost = kW x hours x rate Room area times a watts-per-square-foot estimate gives the cooling load, which is then priced by run time and rate.

Why does Room Cooling Cost matter?

Scaling cooling power to room size shows why oversized units waste energy and why sealing a room cuts the bill.

What values do I need to enter?

This calculator takes 4 inputs: Room size, Watts per sq ft, 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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