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Air Conditioner Cost Calculator

Find out exactly how much your air conditioner costs to run. This calculator uses your AC's BTU rating and SEER efficiency to calculate energy consumption and costs for any usage pattern.

The cooling capacity of your AC in BTUs (British Thermal Units)

Seasonal Energy Efficiency Ratio - higher is more efficient

Average hours the AC runs per day

Your electricity rate per kilowatt-hour

Number of days per month the AC is used

How to Use

1 Find the BTU rating on your AC unit label or in the manual
2 Check the SEER rating (usually on the EnergyGuide sticker)
3 Estimate how many hours per day the AC runs
4 Enter your electricity rate from your utility bill
5 View your estimated daily, monthly, and yearly cooling costs

Formula

Wattage wattage = BTU ÷ SEER
Daily kWh daily_kwh = wattage × hours_per_day ÷ 1000
Daily Cost daily_cost = daily_kwh × price_per_kwh
Monthly Cost monthly_cost = daily_cost × days_per_month
Yearly Cost yearly_cost = monthly_cost × 12

Example: 12,000 BTU Window AC

A 12,000 BTU window AC with a SEER rating of 14 running 8 hours per day at $0.12/kWh costs about $0.82 per day, $24.69 per month, or $296.23 per year.

Why It Matters

Air conditioning is often the largest single energy expense in a home during summer months. Understanding your AC's operating cost can help you decide when to upgrade to a more efficient unit or adjust your usage habits to save money.

Who Uses This Calculator?

  • • Homeowners and renters estimating electricity costs, appliance usage, solar savings, or EV charging expenses.
  • • Solar shoppers, EV owners, and households comparing energy upgrades before requesting quotes or changing usage habits.
  • • Anyone who wants a quick estimate of home energy costs using clear assumptions.

Frequently Asked Questions

What is a good SEER rating for an air conditioner?
A SEER rating of 14 or higher is considered good. Modern high-efficiency units can have SEER ratings of 20-25+. The minimum SEER rating for new central AC units in the US is 14 (as of 2023). Higher SEER ratings mean lower operating costs.
How many BTUs do I need for my room?
A general rule is 20 BTU per square foot of living space. For a 300 sq ft room, you need about 6,000 BTUs. For a 1,000 sq ft space, about 20,000 BTUs. Factors like ceiling height, insulation, and sun exposure also affect the required capacity.
Why is my AC electric bill so high?
High AC bills can be caused by an old or inefficient unit, dirty filters, poor insulation, thermostat set too low, air leaks in your home, or running the AC during peak rate hours. Regular maintenance and proper insulation can significantly reduce costs.
How much does it cost to run central air per month?
Central air conditioning typically costs between $50 and $200+ per month depending on the size of your home, the efficiency of your system, your local electricity rate, and how often you run it. A typical 3-ton central AC system uses about 3,000-3,500 watts per hour.

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This calculator provides estimates for informational purposes only. Verify results with a qualified professional for important decisions.