The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
Mitsubishi Electric · Single-Zone
MSZ-WX24NL / MUZ-WX24NL
~$2,690approximate retailer price at last check, equipment only
Best forLarge rooms in mild climates where the Mitsubishi installer network is the draw.
Mitsubishi's budget WX line in its 24,000 BTU size is the cheapest large wall system the brand sells, at about $2,690 for the pair. It rates 18 SEER2 and 8.5 HSPF2, publishes up to 22,400 BTU cooling and 26,000 BTU heating, and heats down to -4°F, which is a clear step down from the -22°F of the Hyper-Heat GX and FX. It is the system for a large room in a mild climate where the owner wants a Mitsubishi dealer behind the install. In a cold place the GX24 at $4,815 or the Fujitsu Orion 24k are the real answers; against LG's standard 24k and Daikin's Entra, the WX gives up efficiency but keeps the Comfort app Wi-Fi.
No current listing on NEEP's cold-climate heat pump list (checked October 8, 2026). Mitsubishi Electric rates it to keep running down to -4°F; without a listing there's no certified 5°F capacity figure to check that claim against.
Covers the Mitsubishi M-Series wall units (FS/FX, GL/GX, EX, WX) line as a whole, summarised from 440 owner discussion threads, with the replies on the 12 most-discussed.
Most buyers pick Mitsubishi wall units for reliability and installer support, and the owners who are happy tend to stay happy. A Vermont household on its fourth winter with an 18k and a 12k cold-climate pair says the units kept running through a -16F morning and kept the house mostly warm. Another owner's 3/4-ton unit iced into a block in a storm and was still blowing 110F air. Others describe single heads that have run for years without trouble. Owners also say the units feel plain next to cheaper brands: no factory Wi-Fi, no coil dry-out after cooling, and no temperature display on the head.
The complaints are mostly about control, not hardware. The sensor sits in the head, high on the wall and near the warm air leaving it. One reply puts it at 4-6 degrees above the room, with a 2-3 degree swing before the unit reacts. In winter that shows up as a head blowing lukewarm air on low fan while the room stays cold. On multi-zone systems, small bedroom heads such as a GX09 can push a room far past the setpoint: one owner set 54F and got 74F, with 125F air coming out. One owner who wired a home-built external temperature sensor into the system says it halved the energy use, though another with the iSee sensor still had cool air in sub-zero weather. Running costs at New England electricity rates shock some owners, and a few multi-zone systems needed repeated service calls. One Boston household lost three compressors and two control boards in four years on a five-head system.
The evidence fits cold-climate buyers who want a dealer-installed system and plan to sort out temperature sensing early, or to size outdoor units 1:1 so small bedroom heads are not overdriven. Owners agree that install quality and sizing matter as much as the brand.
Only in a mild climate. Its heating floor is -4°F, it is not NEEP listed so no certified low-temperature capacity is published, and the HSPF2 is 8.5. Choose the GX24 or FX24 for cold regions.
The price is about $2,690, well below the GX24 at about $4,815. That works for a large space in a moderate climate where heating is secondary.
Mitsubishi lists about 1,000 sq ft. That suits one big open room; a single 24k head will not heat closed-off rooms elsewhere in the house.
DiscontinuedMitsubishi Electric · Single-Zone
~$2,680
Cold-climate homeowners who want the most-recommended, most-serviceable premium 12k unit and are willing to pay for a certified install.
Series photoMitsubishi Electric · Single-Zone
~$2,570
Buyers who want Mitsubishi's cold-climate heating in a small room without paying FX prices.
Series photoMitsubishi Electric · Single-Zone
~$2,511
Moderate-climate rooms where the head mostly cools and handles spring and fall heating, and GL12 owners replacing like for like.