Brand guide · United States · checked October 19, 2026
AUX heat pumps
AUX is made by AUX (China). ENERGY STAR lists 117 AUX outdoor models certified for the US, 102 of them cold-climate, and its best certified pairing heats at a COP of 2.52 at 5°F.
AUX at a glance
- Who owns it
- AUX (China). Heat pump certifications are held by AUX Air Conditioner Co., Ltd. per ENERGY STAR. No 2024-2026 ownership change verified.
- Headquarters
- Ningbo, China
- How it's sold
- Not published
- Price tier
- Not rated. No price source found; no official North American AUX HVAC site could be read.
- What it makes
- ductless mini-split, multi-zone, ducted central
- Names on ENERGY STAR's list
- AUX, Aufit, Xtron (certified by AUX AIR CONDITIONER CO., LTD.)
Product lines
The current residential heat pump lines we found on AUX's own pages, with the low-temperature claim in the maker's words. 4 of 4 are sold as cold-climate.
| Line | Type | Cold-climate | Maker's low-temperature claim | Refrigerant |
|---|---|---|---|---|
| C-Series | ductless mini-split | Yes | No low-temperature figure published | R-32 |
| M-Series | ductless mini-split | Yes | No low-temperature figure published | R-32 |
| A-Series | ductless mini-split | Yes | No low-temperature figure published | R-32 |
| B-Series | ducted central | Yes | No low-temperature figure published | R-32 |
Certified models with the best cold-weather numbers
From ENERGY STAR's list for the US (updated October 19, 2026): each row is one outdoor unit with its best certified pairing. 117 of 117 AUX outdoor models use R-454B or R-32; the tables show those.
Mini-splits and multi-splits (112 models)
| Outdoor / indoor model | Size | Heat at 5°F | COP at 5°F | HSPF2 | SEER2 | Refrigerant | AHRI # |
|---|---|---|---|---|---|---|---|
| AFEB09HP115V1CO AFEB09HP115V1CH C-Series | 9,700 BTU/h 1-ton | 9,200 BTU/h 95% of rated | 2.52 | 9.5 | 22.0 | R-32 ENERGY STAR Cold Climate | 214290017 |
| ASW-H18E3B2/*R3DI-C3 ASW-H18E3B2/*R3DI-C3 M-Series | 17,700 BTU/h 1.5-ton | 14,000 BTU/h 79% of rated | 2.43 | 9.7 | 21.0 | R-32 ENERGY STAR Cold Climate | 214841718 |
| ASW-H12C5C2/*R3DI-C5 ASW-H12C5C2/*R3DI-C5 M-Series | 12,300 BTU/h 1-ton | 9,600 BTU/h 78% of rated | 2.32 | 10.1 | 23.0 | R-32 ENERGY STAR Cold Climate | 214841717 |
| AFEB12HP115V1CO AFEB12HP115V1CH C-Series | 12,300 BTU/h 1-ton | 9,200 BTU/h 75% of rated | 2.32 | 9.5 | 22.0 | R-32 ENERGY STAR Cold Climate | 214290019 |
| ASW-H18E3B2/*R3DI-D2 ASW-H18E3B2/*R3DI-D2 M-Series | 18,200 BTU/h 1.5-ton | 15,000 BTU/h 82% of rated | 2.25 | 10.5 | 25.0 | R-32 ENERGY STAR Cold Climate | 215218928 |
| AFEB24HP230V1CO AFEB24HP230V1CH C-Series | 24,000 BTU/h 2-ton | 20,800 BTU/h 87% of rated | 2.20 | 10.0 | 22.0 | R-32 ENERGY STAR Cold Climate | 214290023 |
Central (ducted) split systems (6 models)
| Outdoor / indoor model | Size | Heat at 5°F | COP at 5°F | HSPF2 | SEER2 | Refrigerant | AHRI # |
|---|---|---|---|---|---|---|---|
| AHU48HPV1BO AHU48HPV1BI B-Series | 49,000 BTU/h 4-ton | 48,000 BTU/h 98% of rated | 2.00 | 9.5 | 17.0 | R-32 ENERGY STAR Cold Climate | 217729382 |
| AHU60HPV1BO AHU60HPV1BI B-Series | 55,000 BTU/h 4.5-ton | 48,000 BTU/h 87% of rated | 2.00 | 9.5 | 16.5 | R-32 ENERGY STAR Cold Climate | 217729383 |
| AHU36HPV1BO AHU36HPV1BI B-Series | 38,000 BTU/h 3-ton | 38,000 BTU/h 100% of rated | 1.90 | 10.0 | 18.2 | R-32 ENERGY STAR Cold Climate | 217729381 |
| AHU18HPV1BO AHU18HPV1BI B-Series | 22,000 BTU/h 1.5-ton | 20,400 BTU/h 93% of rated | 1.90 | 9.0 | 19.2 | R-32 ENERGY STAR Cold Climate | 217729378 |
| AHU30HPV1BO AHU30HPV1BI B-Series | 33,000 BTU/h 2.5-ton | 32,200 BTU/h 98% of rated | 1.82 | 9.0 | 18.0 | R-32 ENERGY STAR Cold Climate | 217729380 |
| AHU24HPV1BO AHU24HPV1BI B-Series | 26,000 BTU/h 2-ton | 23,000 BTU/h 89% of rated | 1.80 | 9.5 | 19.0 | R-32 ENERGY STAR Cold Climate | 217729379 |
Most efficient for cooling
| Outdoor / indoor model | Size | SEER2 | EER2 | HSPF2 | COP at 5°F | Refrigerant | AHRI # |
|---|---|---|---|---|---|---|---|
| AMAR09HP115V1CO AMAR09HP115V1CH C-Series | 10,000 BTU/h 1-ton | 25.0 | 14.0 | 10.5 | 2.00 | R-32 ENERGY STAR Cold Climate | 214290016 |
| AMAR18HP230V1CO AMAR18HP230V1CH C-Series | 18,200 BTU/h 1.5-ton | 25.0 | 14.0 | 10.2 | 2.20 | R-32 ENERGY STAR Cold Climate | 214290022 |
| AMAR24HP230V1CO AMAR24HP230V1CH C-Series | 24,000 BTU/h 2-ton | 25.0 | 14.0 | 10.5 | 2.10 | R-32 ENERGY STAR Cold Climate | 214290024 |
| ASW-H18E3B2/*R3DI-D2 ASW-H18E3B2/*R3DI-D2 M-Series | 18,200 BTU/h 1.5-ton | 25.0 | 14.0 | 10.5 | 2.25 | R-32 ENERGY STAR Cold Climate | 215218928 |
Look up any pairing by its AHRI number in the AHRI Directory ↗ or search the model in ENERGY STAR's product finder ↗. Ratings are for the exact indoor and outdoor pairing shown.
Warranty
Strengths and watch-outs
Strengths
- Every AUX-certified heat pump on ENERGY STAR uses R-32 (A2L)
- Many AUX mini/multi-split models are listed as ENERGY STAR Cold Climate
Watch-outs
- No official North American AUX HVAC website, distributor or warranty document could be verified. Confirm who stands behind the warranty before buying.
- Line names come from ENERGY STAR series labels (C-, M-, A-, B-Series) and may not match retail names
- AUX also certifies heat pumps sold under the AUFIT and XTRON brands, so the same hardware may appear under other names
Which rebates AUX models fit
Every model in these tables is ENERGY STAR certified, which is the federal equipment rule for the Home Electrification and Appliance Rebates where your state runs them. 102 AUX outdoor models also meet ENERGY STAR Cold Climate, which several utility programs require. The 25C tax credit ended for heat pumps placed in service after December 31, 2025.
Rebate rules by metro:
Get quotes for AUX or a comparable heat pump
Tell us about your home and what you want to heat. A person reads every request and replies with the contractors and rebate programs that serve your ZIP code.
Sources
Model counts and ratings: ENERGY STAR Certified Heat Pumps, updated October 19, 2026. Brand facts checked October 19, 2026 on: