If you're shopping for a new air conditioner or heat pump, one of the first numbers you'll see on every spec sheet is a SEER2 rating. It's the efficiency score for the equipment — and the minimum you're allowed to install depends on where in the US you live.
The quick answer: the US is split into two regions for SEER2 compliance. In the Northern region, new residential AC condensers must meet at least 13.4 SEER2. In the Southern region, that minimum jumps to 14.3 SEER2. Heat pumps carry a single nationwide floor of 14.3 SEER2. This guide walks through what that looks like on a map, what the table means, and where to double-check before you buy.
The two-region map
The infographic above splits the country into two colors. The rule of thumb: warmer states run their AC harder, so the minimum efficiency they're allowed to install is set higher.
Northern region — minimum 13.4 SEER2 for AC condensers. Roughly, this is the northern tier of states across the country plus Alaska. Cooling load is lower, so the federal minimum is set at a lower bar.
Southern region — minimum 14.3 SEER2 for AC condensers. The southeast, southwest and the sun-heavy West Coast fall here, plus Hawaii. Cooling season is longer, cooling load is higher, and the minimum reflects that.
The federal rules go a step further in the South: some units have to meet an EER2 minimum on top of the SEER2 minimum. If you're shopping there, look at both numbers on the spec sheet, not just the SEER2.
Condenser vs. heat pump minimums
The table at the bottom of the infographic summarizes what applies to what:
| Min. SEER2 Rating | Northern Region | Southern Region |
|---|---|---|
| Condenser (AC) | 13.4 | 14.3 |
| Heat Pump | 14.3 | 14.3 |
Two takeaways from the table:
- For a standard air conditioner, the minimum depends on your region — 13.4 in the North, 14.3 in the South.
- For a heat pump, the minimum is 14.3 SEER2 nationwide. It doesn't matter which region you're in.
If you're comparing an AC-plus-furnace system against a heat pump, that's a small but real detail: the entry-level efficiency bar for heat pumps is the same everywhere.
Where to check current requirements
The infographic is based on minimum efficiency standards published by the U.S. Department of Energy (DOE). Two things worth knowing:
- These minimums can change. DOE updates efficiency standards on its own schedule, and states can layer stricter rules on top. Before a big purchase, check the current requirement at energy.gov.
- Enforcement point matters. In some southern regions, compliance is checked at installation — a below-minimum unit sitting in a warehouse still can't legally go in. In the North, compliance is based on when the unit was manufactured. Your installer will know which applies.
Quick take
- Northern region: AC condensers ≥ 13.4 SEER2, heat pumps ≥ 14.3 SEER2.
- Southern region: AC condensers ≥ 14.3 SEER2, heat pumps ≥ 14.3 SEER2.
- Heat pumps: 14.3 SEER2 minimum nationwide.
- Always double-check at energy.gov before you buy — rules can change.
Shopping on HVACMORE
Everything HVACMORE sells is spec'd and labelled with its SEER2 rating so you can filter for compliance in your region: complete matched systems, heat pumps, gas furnaces and mini splits from Goodman, Daikin and MRCOOL. If you'd rather have someone talk you through it, call 855-575-4822 — US-based, Monday to Friday 8am–9pm ET, weekends included.
Frequently asked questions
What is SEER2? A cooling efficiency rating for residential AC and heat pump equipment, calculated under an updated DOE test procedure. Higher is better.
Which SEER2 minimum applies to me? If you live in the Northern region on the map, 13.4 SEER2 for a new AC condenser. In the Southern region, 14.3 SEER2. Heat pumps: 14.3 SEER2 anywhere in the US.
Can I install a unit below the minimum? No. New residential equipment installed after the standard takes effect has to meet the federal floor for its region, and some southern states check compliance at installation.
What's the difference between SEER and SEER2? SEER2 uses an updated test procedure that produces a slightly lower number for the same physical equipment. Don't compare an old SEER rating to a new SEER2 rating directly.
Where can I check for updates? Minimum efficiency standards are published and updated by the U.S. Department of Energy at energy.gov.
The bottom line
In the North, a new AC condenser needs to hit 13.4 SEER2. In the South, it's 14.3. Heat pumps are 14.3 SEER2 nationwide. Check energy.gov for the current rule before you buy — and when you're ready, HVACMORE has the equipment.
*Based on minimum efficiency standards published by the U.S. Department of Energy (DOE). Subject to change — see energy.gov for current requirements.
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