What Is SEER Rating?
SEER -- Seasonal Energy Efficiency Ratio -- measures how efficiently an air conditioner converts electricity into cooling over an entire season. A higher SEER means lower operating costs. In 2023, the DOE updated the testing standard to SEER2. Here is what it all means.
SEER vs SEER2: What Changed
SEER measured efficiency under one set of test conditions. SEER2 uses updated external static pressure (ductwork resistance) conditions that better reflect real-world performance. A SEER2 rating is roughly 4-5% lower than the equivalent SEER rating. A system rated at 16 SEER is approximately 15.2 SEER2.
For equipment purchased after January 1, 2023, SEER2 is the standard. New federal minimum efficiency requirements also took effect in 2023, varying by region.
What SEER Rating Means in Practice
Going from 14 SEER2 to 18 SEER2 can reduce cooling energy use by 20-25%. At $0.15/kWh, that savings on a typical home can be $150-$300 per year. Payback on the premium depends on local electricity rates and how many hours per year you cool.
Is a High SEER Rating Worth It?
In hot climates with long cooling seasons (Florida, Texas, Arizona), high-SEER systems pay back the premium in 5-8 years. In mild climates where cooling runs only 3-4 months, the payback period stretches to 10+ years and mid-efficiency systems often make more financial sense.
Consider energy rebates: many utilities offer $100-$500 rebates on systems meeting certain SEER2 thresholds. Check your utility website before finalizing equipment selection.
Frequently Asked Questions
- What is a good SEER rating for an air conditioner?
- For most homeowners, a 16-18 SEER2 system offers a good balance of upfront cost and operating efficiency. In hot climates with high electricity costs, 18-20 SEER2 may offer a reasonable payback. The federal minimum is 13-14 SEER2 depending on your region.
- Does a higher SEER rating mean lower electric bills?
- Yes -- a higher SEER2 rating means the system uses less electricity to produce the same amount of cooling. Going from 14 SEER2 to 18 SEER2 typically reduces cooling electricity use by 20-25%, which translates to $150-$350 per year for most homes.
- What is the difference between SEER and SEER2?
- SEER2 is an updated testing standard introduced in 2023 that uses higher external static pressure to better simulate real ductwork conditions. SEER2 ratings run about 4-5% lower than equivalent SEER ratings. Both measure seasonal cooling efficiency -- higher is better.
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