Our take in 30 seconds
Best for: cold and very cold climatesStrengths
- Keeps 86% of its heat at 5°F, so backup heat rarely runs
- Heating efficiency (HSPF2 10) beats 77% of models
- Cooling efficiency up to SEER2 27.5, better than 98% of models
- Variable-speed compressor: quieter, steadier temperatures and better humidity control
Good to know
- Efficiency depends on the indoor unit: SEER2 ranges 20–27.5, so ask which pairing you're quoted
Running-cost calculator
Pre-filled with EIA prices · edit any fieldUses the base certified SEER2 (20) and HSPF2 (10). Assumes the unit is correctly sized. How we calculate.
Heating capacity as it gets colder
A heat pump's output falls as outdoor temperature drops. This is the certified heat output of the Gree GWH18AVEXF-D6DNA1A/O at the three ENERGY STAR test temperatures (cooling capacity is 21,000 BTU/h for reference).
Retention at 17°F: 93% · at 5°F: 86%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $459 a year in Louisiana to $1,888 in Maine, driven by local electricity prices and how much heating or cooling the climate needs. Click a column to sort.
| State | Price | Heating | Cooling | Total / yr |
|---|---|---|---|---|
| Louisiana | 12.87¢ | $189 | $270 | $459 |
| Florida | 14.99¢ | $142 | $378 | $519 |
| Mississippi | 14.43¢ | $273 | $273 | $545 |
| Nevada | 12.72¢ | $321 | $240 | $561 |
| Arizona | 15.05¢ | $221 | $348 | $569 |
| Washington | 14.63¢ | $522 | $54 | $576 |
| Tennessee | 13.42¢ | $395 | $183 | $578 |
| Oregon | 15.92¢ | $535 | $75 | $610 |
| North Carolina | 14.95¢ | $408 | $204 | $612 |
| Arkansas | 14.37¢ | $392 | $226 | $619 |
| Kentucky | 13.80¢ | $464 | $159 | $623 |
| South Carolina | 15.76¢ | $364 | $265 | $629 |
| Georgia | 15.90¢ | $367 | $267 | $634 |
| Texas | 15.91¢ | $301 | $334 | $635 |
| Alabama | 16.33¢ | $377 | $274 | $652 |
| Utah | 13.31¢ | $531 | $126 | $657 |
| Oklahoma | 14.82¢ | $436 | $233 | $669 |
| Idaho | 13.37¢ | $590 | $98 | $688 |
| New Mexico | 16.51¢ | $520 | $173 | $693 |
| Nebraska | 13.54¢ | $597 | $128 | $725 |
| West Virginia | 16.31¢ | $617 | $137 | $754 |
| Missouri | 16.02¢ | $572 | $185 | $757 |
| Virginia | 17.64¢ | $556 | $204 | $759 |
| Kansas | 15.47¢ | $585 | $179 | $763 |
| Wyoming | 14.43¢ | $758 | $76 | $833 |
| Colorado | 17.17¢ | $721 | $126 | $847 |
| Delaware | 18.70¢ | $668 | $196 | $864 |
| Indiana | 17.02¢ | $715 | $152 | $867 |
| North Dakota | 13.31¢ | $811 | $63 | $873 |
| California | 29.75¢ | $562 | $312 | $875 |
| Montana | 15.57¢ | $817 | $74 | $891 |
| South Dakota | 15.15¢ | $795 | $103 | $899 |
| Iowa | 17.06¢ | $824 | $134 | $958 |
| Ohio | 19.38¢ | $814 | $163 | $977 |
| Maryland | 21.40¢ | $764 | $225 | $989 |
| Illinois | 19.32¢ | $852 | $162 | $1,014 |
| Minnesota | 17.20¢ | $975 | $99 | $1,075 |
| Pennsylvania | 21.77¢ | $914 | $183 | $1,097 |
| Wisconsin | 19.41¢ | $1,019 | $122 | $1,141 |
| New Jersey | 24.61¢ | $930 | $233 | $1,163 |
| District of Columbia | 25.98¢ | $873 | $300 | $1,173 |
| Connecticut | 24.51¢ | $1,132 | $167 | $1,300 |
| Michigan | 22.99¢ | $1,159 | $145 | $1,304 |
| Hawaii | 47.18¢ | $50 | $1,288 | $1,338 |
| Vermont | 23.84¢ | $1,302 | $113 | $1,414 |
| Rhode Island | 28.18¢ | $1,302 | $178 | $1,479 |
| New York | 28.65¢ | $1,324 | $196 | $1,519 |
| New Hampshire | 27.64¢ | $1,451 | $145 | $1,596 |
| Massachusetts | 30.48¢ | $1,472 | $192 | $1,664 |
| Alaska | 29.41¢ | $1,853 | $31 | $1,884 |
| Maine | 32.11¢ | $1,753 | $135 | $1,888 |
Same equipment sold under other brands
These listings share the same certifying manufacturer (Gree Electric Appliances Inc. of Zhuhai) and identical certified capacities and efficiency ratings, so they are almost certainly the same hardware with a different badge. If you get quotes for any of them, you are comparing installation price and warranty, not equipment. How rebadging works.
- Gree GWH18AVEXF-D6DNA1B/O
- Kinghome KW18XQ29S1DO
Similar-size alternatives
Other mini-split / multi-split units within ±15% of this model's cooling capacity, sorted by efficiency. Cost difference is versus the Gree GWH18AVEXF-D6DNA1A/O at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Bryant 37MARAQ18AA3 | 18,000 | 20–23.9 | 13.5 | 71% | $610 (−$210) | Compare |
| Senville SENA-24HF-OG | 24,000 | 19–21 | 13.5 | 83% | $876 (+$57) | Compare |
| Bryant 37MAHAQ18AA3 | 18,000 | 18–21.5 | 12.4 | 90% | $668 (−$152) | Compare |
| Senville SENA-18HF-OG | 18,000 | 18–21.4 | 12.3 | 90% | $672 (−$148) | Compare |
| Senville SENA/24HF/OQ | 24,000 | 19.2–21.5 | 11.5 | 93% | $982 (+$162) | Compare |
| Fujitsu AOUH18KUAS1 | 18,000 | 18.6–26.3 | 11.4 | 82% | $744 (−$76) | Compare |
Full specifications
| Brand | Gree |
| Outdoor model | GWH18AVEXF-D6DNA1A/O |
| Certified by | Gree Electric Appliances Inc. of Zhuhai |
| Product type | Mini-split / multi-split |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-32 |
| Cooling capacity | 21,000 BTU/h |
| Nominal size | 2 tons |
| SEER2 (certified range) | 20 – 27.5 |
| EER2 (best) | 14.3 |
| HSPF2 (best) | 10 |
| Heating capacity @ 47°F | 21,000 BTU/h |
| Heating capacity @ 17°F | 19,500 BTU/h |
| Heating capacity @ 5°F | 18,000 BTU/h |
| COP @ 5°F | 1.8 |
| ENERGY STAR cold-climate | Yes |
| Certified indoor pairings | 7 |
| Latest certification | 2026-09 |
Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), retrieved November 7, 2026. Capacities and HSPF2 are the highest values across certified pairings; confirm your exact system's AHRI reference number with your installer.
Frequently asked questions
How much does the Gree GWH18AVEXF-D6DNA1A/O cost to run per year?
At the U.S. average residential electricity price of 18.16¢/kWh and typical national heating and cooling hours, we estimate about $820 per year ($610 heating, $210 cooling). It ranges from about $459 in Louisiana to $1,888 in Maine.
Does the Gree GWH18AVEXF-D6DNA1A/O work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 18,000 BTU/h at 5°F, 86% of its 47°F capacity, with a COP of 1.8 at 5°F.
What size is the Gree GWH18AVEXF-D6DNA1A/O?
It is rated at 21,000 BTU/h of cooling, roughly 2 tons, and 21,000 BTU/h of heating at 47°F. Proper sizing should be confirmed with a Manual J load calculation.
Is the Gree GWH18AVEXF-D6DNA1A/O the same as the Gree GWH18AVEXF-D6DNA1B/O?
Very likely. Both are certified by Gree Electric Appliances Inc. of Zhuhai with identical capacities and efficiency ratings in the ENERGY STAR database, which indicates the same equipment sold under different brands.