Summer Utility Cost Calculator
How It Works
This summer utility cost calculator uses established formulas to provide accurate results.
The basic rule:
- BTU Needed = Square Footage x 20 BTU/sq ft
- kWh per Hour = (BTU / 1000) / SEER Rating
- Monthly Cost = kWh/hour x Monthly Run Hours x Electric Rate
- Each degree above 72F saves approximately 3% on cooling
Results are estimates. Consult a professional for critical decisions.
Frequently Asked Questions
How much does it cost to run AC per month?
The average US household spends $150-350/month on summer cooling depending on region, home size, and AC efficiency. Southern states average $250+/month, while northern states average $80-150.
Does raising the thermostat really save money?
Yes. Each degree you raise the thermostat above 72F saves approximately 3% on cooling costs. Setting it to 78F instead of 72F can save 18% or more on your summer electric bill.
When should I replace my AC unit?
Consider replacing units over 15 years old. Modern units (SEER 16+) use 30-50% less energy than older units (SEER 8-10). A new unit often pays for itself in 5-7 years through energy savings.
What other ways can I reduce summer cooling costs?
Use ceiling fans (costs pennies/hour), seal air leaks, add attic insulation, use blackout curtains, run AC primarily at night, and keep the outdoor unit shaded and clean.