Gree Sapphire R-32 18,000 BTU

The 18k Sapphire R-32 is rated 27.5 SEER2, 14.3 EER2 and 10.0 HSPF2 and carries an Energy Star Cold Climate designation. Gree's brochure shows rated heating of 18,600 BTU/h at 47°F and 15,500 at 17°F, with a maximum of 18,000 BTU/h at 5°F (COP 1.8), and heating continues to -22°F, so the system holds its nameplate in cold weather rather than just limping on. The indoor head runs 35 to 49 dB(A). The money is the issue: the dealer kit is about $4,101, against about $2,090 for the Senville Aura 18k, which also heats to -22°F with a 10-year compressor term. Gree's case is the published low-temperature capacity data, the 131 ft lineset limit and a contractor network; most buyers will find the Aura cheaper for similar claims.

• 18,000 BTU/h max at 5°F
• 131 ft max lineset
• Energy Star Cold Climate

At 5°F it still makes 97% of its rated heat, according to the certified NEEP listing for this pairing. Gree rates it to keep running down to -22°F.

COP at 5°F

1.8

Refrigerant

R-32

AHRI cert.

215295786

ENERGY STAR cold climate

Yes

Pairing: SAP18HP230V1R32AO with SAP18HP230V1R32AH. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.

Owners treat the Sapphire as a cold-climate single-zone unit that costs less than the big names, and the most enthusiastic of them run it as their main heat source. A New England owner heats a 1,000 sq ft apartment over a garage with a 24k unit and says it barely runs most of the day. A southern Vermont owner says it kept working at -17F, though it was working hard and they would still keep a backup, and that their heating bill was about half what oil had cost. A Connecticut owner has run a 12k since 2017 alongside a Midea, and logged nearly the same electricity per heating degree day every winter. On the newer R-32 generation, one owner's 24k ran through a winter near -32C with no other heat source down to about -25C.

Most complaints are about how the unit modulates, not raw capacity. The 12k model gets praise for idling at under 100 watts. Two 18k owners describe it cycling off rather than modulating down, one never dropping below about 800W and another switching off for up to an hour. The first traced it to firmware stuck at v1.0 that the app cannot update in the US, while a 12k owner replies that the unit is probably oversized for its room. A Maine owner with three rebadged 12k heads says they settle 1-5 degrees below the setpoint at some loads. The return-air sensor is easily fooled: two owners whose head was 'boiling' the room found cold outside air leaking in through an unsealed wall penetration. The 22k and 24k sizes use 5/8-inch line sets that DIY installers find hard to bend.

The evidence fits a DIY-capable owner, or one with a willing installer, heating a defined space in a cold climate who wants high efficiency for the money. Buyers note the same unit is sold under other badges, sometimes cheaper and with better support, and that US distribution and cold-climate owner reports are harder to find than for Mitsubishi.