HVAC SEER Savings Calculator
Annual cooling energy and cost saved by upgrading to a higher-SEER air conditioner
Related calculators
All energy- Heat Pump Savings CalculatorHeating savings vs electric resistance, gas, oil, or propane
- Insulation Savings CalculatorAnnual heating cost saved by upgrading a surface's R-value
- LED Savings CalculatorEnergy, money, and CO2 saved by switching bulbs to LED
- Solar Panel CalculatorSystem size, cost after incentives, savings, and payback from your bill
- Carbon Footprint CalculatorAnnual household CO2 from energy and travel, broken down by source
- EV Savings CalculatorCompare electric vs gas fuel cost per year, per mile, and lifetime
Quick summary
Enter your AC size in tons, annual cooling hours, your current and new SEER ratings, and your electricity rate to estimate the cooling energy and money saved. SEER is cooling output per unit of electricity, so going from SEER 10 to SEER 16 on a 3-ton unit running 1,000 hours saves about 1,350 kWh — roughly $216 a year at $0.16/kWh. Savings scale with how much you run the AC: large in hot climates, modest in mild ones.
Reviewed by Simple Calculators TeamLast reviewed
How to use this calculator
- Enter the inputs requested by the calculator.
- Choose the units or options that match your situation and review the assumptions.
- Run or update the calculation to see the result.
- Review the result, breakdown, and formulas shown on the page.
- Check the inputs, units, dates, and limitations before saving or sharing the result.
Frequently asked questions
What does SEER mean and why does it matter?
SEER (Seasonal Energy Efficiency Ratio) is the cooling output in BTU per watt-hour of electricity over a season. A higher SEER means the same cooling for less power. Going from SEER 10 to 16 cuts cooling energy by about 38% ((16−10)/16), directly lowering your summer electricity bill.
How much will a higher-SEER AC save me?
It depends on your climate and usage. Energy use is tons × 12,000 × cooling hours ÷ SEER. The more hours you cool (hot, humid regions), the bigger the savings from a SEER upgrade. In mild climates with light AC use, the annual dollar savings may be too small to justify replacing a working unit for efficiency alone.
What is SEER2?
SEER2 is an updated US test standard (effective 2023) using more realistic conditions; SEER2 values run a few percent lower than the old SEER for the same equipment. You can compare old and new ratings in this calculator as long as you're consistent — compare SEER to SEER, or SEER2 to SEER2.
How many cooling hours should I enter?
Use equivalent full-load cooling hours for your area — roughly 500–800 in mild northern climates, 1,000–2,000+ in hot southern ones. If unsure, start around 1,000 and adjust. Your utility or an HVAC contractor can give a local figure; the result scales directly with this number.
Key terms
- SEER
- Seasonal Energy Efficiency Ratio — cooling BTU per watt-hour; higher is better.
- Ton
- AC capacity unit; 1 ton = 12,000 BTU/hour of cooling.
- Cooling Hours
- Equivalent full-load hours the AC runs per year; drives total savings.
Methodology, sources & limitations
This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.
For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.