SEER Rating Savings Calculator
Estimate your annual electricity cost savings when upgrading from an older air conditioner to a higher SEER (Seasonal Energy Efficiency Ratio) rated unit.
Typical home: 18,000–60,000 BTU/hr (1.5–5 tons)
Pre-2006 units are often SEER 6–10
Modern high-efficiency units: SEER 16–26+
Varies by climate: 500 (cool) – 3,000+ (hot/humid)
U.S. average ≈ $0.13/kWh (check your utility bill)
Formula
Annual Energy Consumption (kWh/year):
Energy = (Cooling Capacity [BTU/hr] × Annual Cooling Hours) / (SEER × 1,000)
Annual Operating Cost:
Cost ($) = Energy (kWh) × Electricity Rate ($/kWh)
Annual Savings:
Savings ($) = Cost_old − Cost_new
Percentage Savings:
Savings (%) = (1 − SEER_old / SEER_new) × 100
SEER (Seasonal Energy Efficiency Ratio) is defined as the total cooling output (BTU) divided by the total electrical energy input (Wh) over a typical cooling season. A higher SEER means less electricity consumed per BTU of cooling delivered.
Assumptions & References
- SEER ratings are measured under standardized conditions defined by AHRI Standard 210/240 (Air-Conditioning, Heating, and Refrigeration Institute).
- The formula assumes the unit operates at its rated SEER efficiency throughout the cooling season (real-world performance may vary with climate, duct losses, and maintenance).
- Annual cooling hours vary significantly by region: ~500 hrs (northern U.S.) to 3,000+ hrs (southern U.S. / hot climates).
- The U.S. average residential electricity rate is approximately $0.13/kWh (EIA, 2024); check your utility bill for your local rate.
- As of 2023, the U.S. Department of Energy mandates a minimum SEER of 14 (North) and 15 (South/Southwest) for new central AC units.
- The incremental upgrade cost estimate ($100 per SEER point per ton) is a rough industry rule of thumb and should not replace actual contractor quotes.
- CO₂ savings can be estimated using the EPA's average grid emission factor of 0.386 kg CO₂/kWh (eGRID 2022).
- References: U.S. DOE – Central Air Conditioning; AHRI Directory; EIA Electric Power Monthly.