SEER2 Cost Calculator
Estimate your AC operating costs based on system tonnage, SEER2 rating, daily run time, and local electricity rates.
For Licensed & Trained HVAC Technicians Only
This checklist is intended exclusively for use by licensed, certified, and trained HVAC professionals. It is not a DIY guide and should not be used by untrained individuals to perform repairs or diagnostics. The purpose of this checklist is to help qualified technicians maintain a consistent, step-by-step workflow so that no critical step is overlooked or skipped during service.
Estimate cost of running AC
Residential split systems are typically 2.5–5 tons; 5.5–6 ton units are common on larger homes and light commercial.
Pick two SEER2 ratings to see how much you would save (or spend) by choosing one over the other. The federal minimum for new residential AC in the southern US is 14.3 SEER2.
How much more does the higher-SEER2 system cost up front? We'll calculate how long it takes for the energy savings to pay back that difference.
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 SEER2 Ratings
SEER2 (Seasonal Energy Efficiency Ratio 2) measures how efficiently an air conditioner converts electricity into cooling over a typical cooling season, using the updated M1 testing procedure adopted in January 2023. Higher SEER2 ratings mean lower operating costs but typically higher equipment prices.
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 19 SEER2 unit costs ~25% less to run than a 13.4 SEER2
- 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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