Estimate cost of running AC
Estimate your air conditioning operating costs based on system efficiency, electricity rates, and usage patterns.
Estimate cost of running AC
= 1.50 Tons
Higher SEER = more efficient. Minimum for new units is 14 SEER.
Based on PG&E Time-of-Use rates. Off-Peak ~$0.38/kWh, Peak ~$0.55/kWh.
Average residential AC runs 6-8 hours per day in mild climates.
Understanding SEER Ratings
SEER (Seasonal Energy Efficiency Ratio) measures how efficiently an air conditioner converts electricity into cooling over a typical cooling season. Higher SEER ratings mean lower operating costs but typically higher equipment prices.
SEER vs. SEER2
As of January 2023, the Department of Energy introduced SEER2, which uses updated testing procedures (M1) with higher external static pressure. SEER2 values are approximately 4.5-5% lower than equivalent SEER ratings for the same equipment.
Tips to Reduce Operating Costs
- Regular Maintenance: Clean filters and coils to maintain peak efficiency
- Smart Thermostat: Program higher temps when away to reduce run time
- Seal Ductwork: Leaky ducts can waste 20-30% of conditioned air
- Upgrade Equipment: A 20 SEER unit costs ~30% less to run than a 14 SEER
- Shade Your Unit: Outdoor units in shade operate more efficiently
- Use Ceiling Fans: Fans allow you to set the thermostat 4°F higher
- Run During Off-Peak: Pre-cool your home during lower rate periods
How Electricity Rates Affect Costs
PG&E uses Time-of-Use (TOU) pricing, meaning electricity costs more during peak demand hours. Running your AC during off-peak hours can significantly reduce your monthly bill.
Off-Peak
12am - 4pm, 9pm - 12am
Peak
4pm - 9pm
Rates shown are approximate PG&E Non-CARE residential rates for 2026. Actual rates vary by plan and tier.
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