The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
Mitsubishi Electric · Floor Mount
MFZ-KX12NL / SUZ-AA12NLHZ
~$4,364approximate retailer price at last check, equipment only
Best forCold-climate rooms with no usable wall space that need real heating output from a low unit.
This is Mitsubishi's floor console with the Hyper-Heat condenser, built for rooms where the walls are glass, sloped or short and a wall head has nowhere to go. Because heat comes out low, it feels more like a baseboard heater than a high wall unit, which helps in a cold basement or sunroom. Maximum heating is 18,000 BTU, full capacity holds down to 5°F, heating is guaranteed to -13°F and the unit keeps running to -22°F. The price is the catch: at roughly $4,400 it is the most expensive 12k floor system in this catalog, and 17.2 SEER2 is low next to a Fujitsu AGUH floor unit at 25. You pay for the cold-weather capacity and the Mitsubishi support network.
At 5°F it still makes its full 47°F rated heat, according to the certified NEEP listing for this pairing. Mitsubishi Electric rates it to keep running down to -22°F.
Pairing: SUZ-AA12NLHZ with MFZ-KX12NL. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
NEEP lists 15,000 BTU at both 47°F and 5°F, so it holds full capacity, with COP 2.1. Mitsubishi rates it to -22°F, against -4°F on the standard version. It costs $4,364 against $3,722.
The indoor unit sits at the baseboard, so there is no wall-hung head and heat rises from the floor. The lineset runs through the wall behind it or out the bottom. It suits rooms with tall windows or sloped ceilings.
SEER2 is 17.2 and HSPF2 10, lower SEER2 than the standard floor mount at 19.6. You pay for the heating capacity rather than cooling efficiency.
The registered 10-year term assumes one. R-454B calls for an installer certified in A2L handling.
Series photoMitsubishi Electric · Floor Mount
~$3,722
Mild-to-moderate climates where a floor console is the only form factor that fits.
Mitsubishi Electric · Multi-Zone
~$4,481
Cold-climate homes that need three rooms conditioned off one outdoor unit and want the most proven hyper-heat multi on the market.
Mitsubishi Electric · Single-Zone
~$4,187
Large open rooms or small open-plan houses in cold climates where one head has to be the main heat source.