The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
Mitsubishi Electric · Concealed Duct
SEZ-AD12NL / SUZ-AA12NL
~$2,747approximate retailer price at last check, equipment only
Best forShallow ceiling or soffit spaces feeding one or two rooms through short ducts.
The SEZ-AD12NL is the shallowest of Mitsubishi's ducted indoor units at 7-7/8 inches tall (39 x 27-9/16 inches wide and deep, 50 lb), meant for short, low-static duct runs feeding one or two rooms from a closet or soffit. It replaces the R-410A SEZ-KD12 and, unlike that unit, has Wi-Fi built in through the Comfort app. With the standard SUZ-AA12NL condenser the system rates 19 SEER2 and 9.6 HSPF2, with 11,500 BTU of cooling and 13,600 BTU of heating, and EER2 of 12.1. At about $2,750 it is the cheapest of the Mitsubishi ceiling, floor and ducted units listed here and roughly $1,000 under the PEAD-AA12NL pairing, in exchange for lower static-pressure capability.
At 5°F it still makes 65% of its rated heat, according to the certified NEEP listing for this pairing. Mitsubishi Electric rates it to keep running down to -4°F.
Pairing: SUZ-AA12NL with SEZ-AD12NL. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
Its body is 7-7/8 inches tall, so it fits a shallow soffit or a low ceiling cavity. It needs a return, short low-static ducts and a condensate path.
At $2,747 it is $1,043 less than the PEAD-AA12NL at $3,790 and has Wi-Fi where the PEAD does not. HSPF2 is 9.6 against 9.7.
NEEP lists 12,000 BTU at 47°F and 7,800 BTU at 5°F, about 65%, with COP 2.31. The maker's floor is -4°F, so it suits moderate winters.
The 10-year registered term requires a licensed contractor and online registration. Standard is 5-year parts and 7-year compressor.
Series photoMitsubishi Electric · Concealed Duct
~$3,790
Hiding one air handler in a soffit or attic and feeding a few small rooms by ductwork.
Series photoMitsubishi Electric · Single-Zone
~$2,690
Large rooms in mild climates where the Mitsubishi installer network is the draw.
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.