Quick answer
A cold-climate heat pump is an air-source heat pump built and certified to keep delivering useful heat efficiently in very cold weather; under ENERGY STAR Version 6.2 it must reach a COP of at least 1.75 at 5°F and keep at least 70% of its 47°F heating capacity at 5°F.
It is still an ordinary air-source heat pump in how it works. The difference is tested performance at low outdoor temperatures, which standard ratings do not show.
Quick facts
The key facts about Cold-Climate Heat Pump, with sources:
- Defining spec
- ENERGY STAR CAC/ASHP Version 6.2 (rev. March 2025), cold climate tier 1
- COP at 5°F
- 1.75 or higher (Appendix M1 H42 test) 1
- Capacity at 5°F
- At least 70% of 47°F capacity 1
- HSPF2
- 8.1+ ducted split and single package; 8.5+ ductless split 1
- SEER2
- 15.2 or higher 1
- Other requirement
- Controls verification procedure (CVP) 2
- Regional spec
- NEEP ccASHP Specification v4.0 (effective 1 Jan 2023); v5.0 pending 3
Key takeaways
- A cold-climate heat pump is tested to heat well at 5°F, which standard ratings do not check.
- ENERGY STAR V6.2 requires COP 1.75 or more at 5°F and 70% or more of 47°F capacity at 5°F 1.
- It also needs 8.1 HSPF2 (ducted) or 8.5 (ductless) and 15.2 SEER2 1.
- NEEP’s v4.0 spec targets IECC climate zone 4 and colder and was written because HSPF has no test points below 17°F 3.
- Gas/electric packaged heat pumps cannot earn the cold-climate label 1.
What makes a heat pump "cold-climate"
All air-source heat pumps lose capacity and efficiency as outdoor air gets colder. The standard heating rating, HSPF2, averages performance for a moderate climate. It says little about how a unit does on a 5°F night.
A cold-climate heat pump closes that gap with extra tests. ENERGY STAR’s Version 6.2 specification adds a 5°F test point using the federal Appendix M1 H42 test.
The unit must keep at least 70% of its rated 47°F heating capacity at 5°F, and its coefficient of performance (COP) at 5°F must be at least 1.75 1.
NEEP, the Northeast Energy Efficiency Partnerships, runs a separate cold-climate specification and product list. Its v4.0 took effect on 1 January 2023, covers IECC climate zone 4 and higher, and exists because HSPF lacks test points below 17°F 3.
How a cold-climate unit holds output in the cold
- Outdoor air falls toward 5°F → less heat available per pound of air
- Variable-speed compressor speeds up, often above nominal → moves more refrigerant
- Enhanced designs (such as vapor injection) keep compression efficient → COP stays above 1
- Defrost runs when ice builds → brief pause in heating
- Below the unit’s limit or the design point → backup heat covers the gap
ENERGY STAR cold-climate criteria (Version 6.2)
| Product type | SEER2 | HSPF2 | COP at 5°F | Capacity at 5°F vs 47°F |
|---|---|---|---|---|
| Split, non-ducted (ductless) | 15.2+ | 8.5+ | 1.75+ | 70%+ |
| Split, ducted | 15.2+ | 8.1+ | 1.75+ | 70%+ |
| Single package | 15.2+ | 8.1+ | 1.75+ | 70%+ |
| Gas/electric package heat pump | Not eligible for cold-climate label | — | — | — |
Comparison chart: standard, ENERGY STAR and cold-climate heat pumps
| Requirement | Federal minimum | ENERGY STAR | ENERGY STAR cold climate |
|---|---|---|---|
| SEER2 | 14.3 | 15.2 | 15.2 |
| EER2 | Not set for heat pumps | 11.0 | Not set in cold tier |
| HSPF2 | 7.5 | 7.8 | 8.1 (8.5 ductless) |
| COP at 5°F | Not tested | Not required | 1.75 or more |
| Capacity at 5°F | Not tested | Not required | 70% of 47°F or more |
| Controls verification | No | No | Yes |
Example: does this heat pump qualify, and will it keep up?
A 3-ton ducted heat pump lists 36,000 BTU/h heating at 47°F, 26,500 BTU/h at 5°F, COP 1.9 at 5°F, 8.3 HSPF2 and 16.5 SEER2 (example spec-sheet figures). Home heat loss at a 5°F design temperature: 30,000 BTU/h (example Manual J).
| Check | Math or rule | Result |
|---|---|---|
| Capacity ratio at 5°F | 26,500 ÷ 36,000 | 74%, passes 70% 1 |
| COP at 5°F | 1.9 vs 1.75 | Passes |
| HSPF2 (ducted) | 8.3 vs 8.1 | Passes |
| SEER2 | 16.5 vs 15.2 | Passes |
| Meets the load at 5°F? | 26,500 vs 30,000 BTU/h | Short by 3,500 BTU/h, about 1 kW of backup (3,500 ÷ 3,412) |
The unit qualifies as cold-climate yet still needs a small amount of backup on design days. That is normal. Qualifying tells you the unit is efficient in the cold; only a load calculation tells you whether it is big enough. See our cold-climate performance research.
Where you will see the cold-climate label
- On the ENERGY STAR product finder, flagged as cold climate.
- On the NEEP ccASHP product list, with capacity and COP at 5°F 3.
- On spec sheets, in low-temperature heating tables.
- In rebate rules in northern states, which often require ENERGY STAR cold climate or a NEEP listing.
- On the AHRI certificate for the matched pair 7.
Benefits and limits
Benefits
- Efficient heat in weather that defeats standard units.
- Less reliance on electric strips (COP 1).
- Can make all-electric heating practical in cold climates.
- Tested numbers at 5°F you can compare.
Limits
- Still loses capacity as it gets colder; backup may be needed.
- Usually costs more than a standard heat pump.
- Needs good snow clearance and defrost drainage.
- Gas/electric packaged units are excluded from the label 1.
What the label does not promise
The cold-climate criteria stop at 5°F. Many models list output below that, but the label does not test it. In places with frequent subzero nights, look at the spec sheet’s lowest rated temperature and plan backup heat.
It also does not size the system. A qualifying unit can still be too small for a drafty house. And it says nothing about ducts: ducts in a cold attic lose heat on the way to rooms.
Cost drivers and incentives
Cold-climate performance usually comes from variable-speed compressors with enhanced cold-weather designs, larger coils and better controls, which raise cost over a standard heat pump. Electrical capacity and backup heat choices add to it.
The federal 25C credit expired for property placed in service after 31 December 2025 6. Many state and utility programs still fund cold-climate heat pumps; see heat pump rebates. HyreHVAC publishes no equipment prices without enough dated quotes.
Sources: [6]
How to choose and install one
- Get a Manual J load at your winter design temperature.
- Shortlist models on the ENERGY STAR cold-climate list or NEEP list 3.
- Compare capacity at 5°F with your design load; decide on backup heat.
- Plan the outdoor unit: raised stand above snow, clear defrost drainage, away from roof drip.
- Set aux heat lockouts and balance point at commissioning.
Refrigerant work requires EPA Section 608 certification. Electrical upgrades need a licensed electrician.
Winter care
- Keep snow and ice clear around and under the outdoor unit.
- Expect steam during defrost; it is normal.
- Check filters monthly in heating season 8.
- Book a fall check of defrost, backup heat and charge 8.
Sources: [8]
Warning signs
- Outdoor coil stays encased in ice for hours.
- Backup heat runs on days well above your design temperature.
- House cannot hold temperature on cold days that the load calculation said it would.
- Error codes on the outdoor board.
- Call a technician; never chip ice off the coil or pour hot water on it.
Specifications and status
ENERGY STAR Version 6.2 (rev. March 2025) sets the cold-climate criteria and requires reporting heating capacity and COP at 5°F per the Appendix M1 H42 test point 1. Federal minimums for heat pumps do not test at 5°F 5.
NEEP’s ccASHP Specification v4.0 has been in effect since 1 January 2023; NEEP lists v5.0 as coming, with an effective date to be set 3. DOE’s Cold Climate Heat Pump Technology Challenge, with partners including EPA, Natural Resources Canada and eight manufacturers, pushed next-generation units through lab and field testing 4.
Misconceptions
- Myth Heat pumps do not work below freezing.
- Reality Cold-climate units are tested to hold COP 1.75 and 70% capacity at 5°F 1.
- Myth A cold-climate unit never needs backup.
- Reality It may, on design days or in a leaky house.
- Myth Any ENERGY STAR heat pump is cold-climate.
- Reality The cold-climate tier is a separate set of tests.
- Myth HSPF2 tells you cold performance.
- Reality HSPF2 has no 5°F point; check COP and capacity at 5°F 3.
Where cold-climate matters in the US
NEEP targets IECC climate zone 4 and colder 3, which covers most of the northern half of the country.
In Ohio and eastern Washington, winter design temperatures can sit near or below 5°F, so cold-climate ratings matter. In Georgia or Texas, a standard heat pump usually suffices. Heating degree days show how cold your season runs.
Do you need one?
If your winter design temperature is below about 17°F, or you want to heat without gas in a cold climate, a cold-climate model is worth the step up. In milder places, a standard ENERGY STAR heat pump is usually enough.
Next step: compare models on our cold-climate heat pump shortlist and run costs with the heat pump vs furnace tool.
Questions about Cold-Climate Heat Pump
What qualifies as a cold-climate heat pump?
Under ENERGY STAR Version 6.2, a cold-climate heat pump must have a COP of at least 1.75 at 5°F, keep at least 70% of its 47°F heating capacity at 5°F, reach 15.2 SEER2 and 8.1 HSPF2 (8.5 for ductless), and pass a controls verification procedure.
How cold can a cold-climate heat pump work?
ENERGY STAR tests them at 5°F, and many models list heating output well below that on their spec sheets. Output keeps falling as it gets colder, so check the lowest rated temperature and plan backup heat for the coldest nights.
What is the NEEP cold climate heat pump list?
NEEP, the Northeast Energy Efficiency Partnerships, keeps a cold-climate air-source heat pump specification and product list. Version 4.0 took effect on 1 January 2023 and covers IECC climate zone 4 and colder. Many northern rebate programs reference it.
Do I need backup heat with a cold-climate heat pump?
Often a little. Even a qualifying unit loses capacity as it gets colder. If its output at your design temperature is below your home’s heat loss, backup heat covers the gap. Your contractor’s load calculation shows how much.
Is a cold-climate heat pump the same as a mini-split?
Not necessarily. Many ductless mini-splits are cold-climate models, but ducted central heat pumps can qualify too. ENERGY STAR sets a higher HSPF2 bar for ductless systems, 8.5, than for ducted ones, 8.1.
Is there a tax credit for cold-climate heat pumps in 2026?
Not the federal 25C credit, which expired for property placed in service after 31 December 2025. Many states and utilities offer rebates for cold-climate models. Check the heat pump rebates page and your utility before buying.
Why is HSPF2 not enough in cold climates?
HSPF2 averages heating over a moderate model climate and has no test point below 17°F. NEEP created its specification for that reason. The 5°F COP and capacity ratio show how a unit behaves in real cold.
Can a packaged heat pump be cold-climate certified?
All-electric single-package heat pumps can, at 8.1 HSPF2 and the same 5°F tests. Gas/electric packaged heat pumps are not eligible for the ENERGY STAR cold-climate label under Version 6.2.
Where should the outdoor unit go in a snowy climate?
On a stand or wall bracket that keeps it above typical snow depth, away from roof edges that drip or shed snow, with a clear path for defrost water to drain and freeze without blocking the unit. Follow the maker’s clearance rules. A blocked coil cannot pull heat from the air.
What COP does a cold-climate heat pump have at 5°F?
At least 1.75 to earn the ENERGY STAR cold-climate label, measured with the federal Appendix M1 H42 test. That means at least 1.75 units of heat for each unit of electricity, compared with 1.0 for electric strip or baseboard heat. Many models list higher figures on their spec sheets.
Sources
- ENERGY STAR, Central Air Conditioner and Heat Pump Specification, Version 6.2 (rev. March 2025), retrieved .
- ENERGY STAR, Air-Source Heat Pumps key product criteria, retrieved .
- NEEP, Cold Climate Air Source Heat Pump Specification and Product List (Version 4.0), retrieved .
- U.S. DOE, Residential Cold Climate Heat Pump Technology Challenge, retrieved .
- eCFR, 10 CFR 430.32 Energy and water conservation standards (current text), retrieved .
- IRS, Energy Efficient Home Improvement Credit (25C), retrieved .
- AHRI Directory of Certified Product Performance, retrieved .
- ENERGY STAR, Maintenance Checklist for heating and cooling, retrieved .
Expert review
Written by the HyreHVAC Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Criteria read from the ENERGY STAR V6.2 specification PDF (text extracted 10 October 2026) and the key product criteria page; NEEP version from its product-list page; DOE challenge facts from its page; federal floors from 10 CFR 430.32. The qualifying example uses labelled hypothetical figures.
Suggest a correction. We fix errors and say what changed.