SEER Savings Calculator
Estimate your annual energy and cost savings when upgrading from an older, less efficient air conditioner to a higher SEER (Seasonal Energy Efficiency Ratio) rated unit.
Typical older systems: 6–12 SEER
Modern systems: 13–26+ SEER (ENERGY STAR ≥ 15)
1 ton = 12,000 BTU/hr. Typical home: 24,000–60,000 BTU/hr
Hot climates: 1,500–3,000 hrs; Mild climates: 500–1,000 hrs
U.S. average ≈ $0.13/kWh (check your utility bill)
Typical AC lifespan: 15–20 years
Formula
Annual Energy Consumption (kWh)
kWh = (Capacity [BTU/hr] × Cooling Hours) ÷ (SEER × 1,000)
Annual Energy Cost
Cost ($) = kWh × Electricity Rate ($/kWh)
Annual Savings
Savings = Costold − Costnew
Lifetime Savings
Lifetime Savings = Annual Savings × System Lifespan (years)
Efficiency Improvement
% Improvement = ((New SEER − Old SEER) ÷ Old SEER) × 100
Assumptions & References
- SEER definition: Seasonal Energy Efficiency Ratio — total cooling output (BTU) divided by total electrical energy input (watt-hours) over a typical cooling season (AHRI Standard 210/240).
- Steady-state assumption: The calculator assumes the unit runs at rated capacity for the entered number of hours. Real-world usage varies with thermostat cycling, humidity, and part-load conditions.
- Minimum efficiency standards: As of 2023, the U.S. DOE requires ≥ 14 SEER (North) / ≥ 15 SEER (South & Southwest) for new split-system central ACs. ENERGY STAR requires ≥ 15 SEER.
- Electricity rate: The U.S. residential average is approximately $0.13/kWh (EIA, 2024). Rates vary significantly by state and utility.
- Cooling hours: Varies by climate zone — roughly 500–1,000 hrs/yr in mild climates, 1,500–3,000 hrs/yr in hot climates (DOE Building America climate data).
- Lifespan: Average central AC lifespan is 15–20 years (ENERGY STAR / ACCA).
- Not included: Installation costs, rebates, tax credits (Federal 25C tax credit offers up to 30% / $600 for qualifying high-efficiency units), financing costs, or inflation adjustments.
- References: AHRI Standard 210/240; U.S. DOE ENERGY STAR; EIA Electric Power Monthly; ACCA Manual J.