SEER2 is the new cooling efficiency rating (replacing SEER as of 2023). It measures the same thing — watts of cooling per watt of electricity — but under more realistic test conditions, so the numbers are about 4–5% lower than the old SEER for the same actual equipment. A 17 SEER unit from 2022 is roughly equivalent to a 16 SEER2 unit in 2026. Higher number = more efficient = lower power bill.
If you've shopped for HVAC equipment in the past couple years, you've seen both SEER and SEER2 numbers. You might have also seen "SEER2-equivalent" or "formerly 18 SEER" on some units. It's genuinely confusing. Here's what it all means and how to use it.
What SEER and SEER2 actually measure.
SEER stands for Seasonal Energy Efficiency Ratio — it's a ratio of cooling output (in BTUs) divided by electrical input (in watt-hours) over a typical cooling season. A higher SEER means more cooling per watt of electricity, which means a lower utility bill.
A 14 SEER system produces 14 BTU of cooling for every watt-hour it draws. A 20 SEER system produces 20 BTU per watt-hour. For the same cooling load, the 20-SEER system uses about 30% less electricity.
Why the rating changed to SEER2.
The U.S. Department of Energy updated the testing procedure in January 2023. The old SEER test was run under artificially favorable conditions — lower duct static pressure than real-world installations. Real duct systems in real houses have more airflow resistance than the test rig, which means real systems work harder and use more electricity than the rating predicted.
SEER2 corrects for this by testing at realistic static pressure. Same unit, same physics, different test. The resulting number is lower — usually by 4–5% — but it's closer to what you'll actually experience.
The conversion cheat sheet.
Rough translation between old SEER and new SEER2:
- 14 SEER (old) ≈ 13.4 SEER2 (new) — the pre-2023 minimum
- 15 SEER ≈ 14.3 SEER2
- 16 SEER ≈ 15.2 SEER2 — the 2023 minimum in the Northwest
- 17 SEER ≈ 16.2 SEER2
- 18 SEER ≈ 17.1 SEER2
- 20 SEER ≈ 19.0 SEER2
The rule of thumb: subtract about 5% from an old SEER number to approximate SEER2.
What this means for your power bill.
The real-dollar difference between efficiency tiers for a 2,500 sq ft Vancouver home running cooling 400 hours a year:
- 14 SEER2 (baseline): ~$180/year in cooling
- 16 SEER2: ~$155/year ($25 savings)
- 17 SEER2: ~$145/year ($35 savings)
- 20 SEER2 inverter: ~$125/year ($55 savings)
For cooling alone, the efficiency upgrades don't dramatically change your bill — Vancouver doesn't cool enough hours per year for huge savings. The bigger story is when those numbers apply to a heat pump, which runs both cooling and heating:
- 14 SEER2 heat pump: ~$850/year combined cooling + heating
- 17 SEER2 heat pump: ~$680/year ($170 savings)
- 20 SEER2 inverter heat pump: ~$570/year ($280 savings)
Heat pumps run year-round in a Vancouver climate, so the efficiency tier pays back more meaningfully.
When the higher tier is worth it.
A 17 SEER2 unit typically costs $2,000–$3,500 more than a 14 SEER2 equivalent. At $170–$280/year in savings (heat pump case), that's a 9–12-year payback.
Where the upgrade starts to clearly make sense:
- You're staying in the house 10+ years. Payback window fits.
- Electric rates are rising. Clark PUD rates have ticked up about 3% annually — the savings compound.
- You care about comfort. Higher-tier units are usually two-stage or variable-speed, which run longer at lower output — more even temperatures, better humidity control, less noise.
- You qualify for rebates. Clark PUD rebate tiers step up at higher efficiency levels. Sometimes the rebate alone covers the upgrade cost.
When the higher tier is not worth it.
- You're moving in 3–5 years. The payback window doesn't finish.
- Your ductwork is bad. Leaky ducts cost more efficiency than any equipment rating can recover. Fix the ducts first.
- You already oversized. A 5-ton unit on a 3-ton load cycles too short to benefit from efficiency features. Sizing matters more than SEER2.
Real talk on marketing numbers
Manufacturers sometimes publish a single high SEER2 rating for a product line, but that rating only applies to a specific combination of outdoor unit + indoor coil + air handler. Change any of those three, and the real SEER2 drops. The AHRI certificate for your actual matched set is the number that counts. We pull that for every quote.
The bottom line.
SEER2 is a more honest number than old SEER. Higher is better, same as before. For Vancouver heat pump installs, stepping up from 14 SEER2 to 17 SEER2 usually pays back; stepping to 20 SEER2 inverter makes sense for long-term homeowners who value comfort and quiet.
For a specific system sized to your home with efficiency options and real operating cost projections, request a quote. We'll walk through the payback math on every tier we offer.