How much does it cost to run an air conditioner?

The cost depends on your AC's size (BTU/tonnage), its efficiency rating (SEER/EER), how many hours you run it, and your local electricity rate. Our calculator helps you estimate the exact cost per hour, day, and month.

How much does it cost to run a 1500W space heater?

A 1500W heater running for one hour uses 1.5 kWh of electricity. At a national average rate of $0.15 per kWh, it costs about 22.5 cents per hour to run.

AC & Heater Cost Calculator

Find out exactly how much your heating and cooling costs you. Enter your device's power, your local electricity rate, and usage hours to see your estimated bill and how many solar panels could offset it.

✅ Hourly & Monthly Costs✅ AC BTU Conversion✅ Heater Wattage✅ Solar Offset Estimation

Appliance Settings

Device Type

Power Output

Unit

Efficiency Rating (SEER/EER)Typical SEER ranges from 13 to 22+

Hours per Day

Electricity Rate ($/kWh)

Room Size (sq ft) - OptionalJust for reference. A standard rule is ~20 BTU per sq ft.

Power Estimate: Your device uses approximately 857 Watts (0.86 kW) when running.

Running Costs

Estimated Monthly Cost

$31.27

208 kWh consumed per month

Hourly Cost

$0.13

Daily Cost

$1.03

Solar Offset Needed

~ 4 Panels

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*Assuming 400W solar panels producing ~60kWh/month each.

💡 How to use this calculator

Select your device: Choose whether you want to calculate costs for an Air Conditioner or a Space Heater.
Enter the power: Input your device's power rating. For ACs, this is typically in BTUs (e.g., 12,000 BTU for a 1-ton AC). For heaters, it is usually in Watts (e.g., 1500W).
Set the usage: Estimate how many hours per day the appliance runs.
Update your rate: Check your latest utility bill for your exact cost per kWh, or leave the default average rate.
View your results: The calculator instantly updates to show your estimated hourly, daily, and monthly costs!