How much can you save going from 13 SEER to 20 SEER2? For a typical 3-ton system in a moderate US climate at $0.16/kWh, this upgrade cuts cooling energy about 38% — saving roughly $214/year and $3,211 over 15 years. In hot southern climates the savings are much larger. The calculator below is pre-set to this upgrade; enter your climate and rate for exact numbers.
Understanding the New DOE SEER2 Efficiency Mandates
As of 2023, the Department of Energy transitioned from the SEER to the SEER2 testing standard to better reflect real-world operating conditions, particularly static pressure in ductwork. Upgrading to a higher SEER2 system directly reduces your monthly energy bills. In the Northern US, the minimum standard is now 13.4 SEER2, while the South and Southwest require a minimum of 14.3 SEER2. The calculator below helps you determine exactly how much money you will save annually by investing in a high-efficiency unit compared to your current system’s rating.
🌡️ How Much Will a Higher SEER2 Save You?
See how much a higher-efficiency AC or heat pump will save you. Compare your old SEER unit to a new SEER2 system and get the annual savings, 15-year total, payback period and energy cut — for your climate and electricity rate.
🔻1. Your Current System (SEER)
Range: 8 – 18 SEER. AC units from before ~2006 are often 8–10 SEER; 2006–2022 units are 13–16 SEER. Check the yellow EnergyGuide label or nameplate.
🔺2. New System (SEER2)
Range: 13.4 – 24 SEER2. Minimum new units are 13.4 (North) / 14.3 (South) SEER2; high-efficiency 16–18; premium variable-speed 19–24.
📏3. System Size
Range: 1.5 – 5 Tons. A typical home is 2–3.5 tons. Not sure? Use our AC Tonnage Calculator.
🌍4. Climate
Hotter climates run the AC far more hours a year, so the savings from higher efficiency are much larger.
⚡5. Electricity Rate
US average is about $0.16/kWh; California, the Northeast & Hawaii run higher. Check your utility bill for the exact figure.
➕Add new system cost (for payback) — optional
Enter the quoted install price to see the payback period. Estimate it with our Replacement Cost Calculator.
13 SEER to 20 SEER2 Savings by Climate
Annual cooling savings for a 3-ton system at $0.16/kWh. Hotter climates run the AC more hours, so the same efficiency jump saves far more:
| Climate | Annual Savings | 15-Year Savings |
|---|---|---|
| Moderate (Midwest, Mid-Atlantic) | $178 | $2,676 |
| Hot & Humid South (FL, TX Gulf) | $392 | $5,887 |
| Desert Southwest (AZ, NV) | $500 | $7,493 |
Is the 13-to-20 Upgrade Worth It?
Going from 13 SEER to 20 SEER2 cuts cooling energy about 38%. Whether that pays off depends on how much you run the AC and your electricity rate: in the hot South or high-rate states the $214–$392/year savings add up fast, while in mild, cheap-power areas the payback is longer. Remember SEER2 reads about 4.5% lower than the old SEER scale — the calculator converts your 13 SEER automatically. High-efficiency units may also qualify for rebates or tax credits. Price the upgrade with our Replacement Cost Calculator.
Frequently Asked Questions
How much does 13 SEER to 20 SEER2 save per year? About $214 a year for a 3-ton system in a moderate climate at $0.16/kWh, rising to $392–$500 in hot climates. That’s roughly a 38% cut in cooling energy.
Is a 20 SEER2 unit much better than 13 SEER? Yes — it uses about 38% less electricity for the same cooling. The bigger your cooling season, the more that efficiency matters.
What is 13 SEER in SEER2? On the newer SEER2 scale a 13 SEER unit is roughly 12.4 SEER2 (about 4.5% lower). The calculator uses this conversion for a fair comparison.
The refrigerant matters too: see how R410A compares with R22 and R134a.
Estimates vary by contractor. Compare free quotes from licensed local pros before you commit. Request a quote →
High-efficiency systems may qualify for utility rebates and federal or state incentives. Find current programs at ENERGY STAR & DSIRE.
Figures are reviewed by the Refcon HVAC engineering team using U.S. DOE, ENERGY STAR & ACCA Manual J data. Estimates only — confirm with a licensed pro.