Mitsubishi SEZ-AD12NL & SUZ-AA12NLHZ 12,000 BTU 16.2 SEER2 Horizontal Ducted Hyper Heat System - R454B

Mitsubishi SEZ‑AD12NL & SUZ‑AA12NLHZ: 12,000 BTU Hyper‑Heating Ducted Concealed Heat‑Pump System

The Mitsubishi SEZ‑AD12NL horizontal‑ducted indoor unit paired with the SUZ‑AA12NLHZ Hyper‑Heating (H2i®) outdoor condenser forms a single‑zone 12,000 BTU system ideal for primary bedrooms, basement suites, or boutique retail spaces that need invisible comfort. Hyper‑Heating INVERTER technology delivers 100 % of rated heat at 5 °F and reliable operation down to –13 °F, while eco‑friendly R‑454B refrigerant and Blue Fin anti‑corrosion coating ensure high efficiency and long service life. 

With an ultra‑slim 7‑7/8 " profile, the SEZ‑AD12NL hides easily in ceiling cavities or soffits. A built‑in condensate lift pump, joint‑lap DC motor, and factory‑installed base‑pan heater (outdoor) simplify installation and cold‑weather performance. 

The system quietly conditions rooms up to about 500 sq ft, producing indoor sound as low as 23 dB(A) and achieving ENERGY STAR® certification with 16.2 SEER2 and 9.4 HSPF2 efficiency ratings.

Control is flexible: wired or wireless remotes, third‑party thermostat interfaces, and full smartphone scheduling through the kumo cloud® app. 

General Information

System Type: Concealed ducted indoor unit + Hyper‑Heat single‑zone heat‑pump condenser
Models: Indoor – SEZ‑AD12NL | Outdoor – SUZ‑AA12NLHZ
Capacities: 12,000 BTU Cooling | up to 18,000 BTU Heating (rated 15,000 BTU) 
Room Size: Ideal for ~500 sq ft
Operating Modes: Heating & Cooling (–13 °F – 115 °F)
ENERGY STAR®: Yes 
Refrigerant / Charge: R‑454B, 3 lb factory charge

Key Features

• Hyper‑Heating INVERTER®: 100 % heat at 5 °F; guaranteed to –13 °F. 

• INVERTER‑Driven Compressor: Precise energy‑saving modulation. 

• Ultra‑Slim, Low‑Profile Cabinet: 7‑7/8 " height fits tight spaces. 

• Built‑In Drain Pump: 21 " lift for worry‑free condensate removal.

• Base‑Pan Heater & Blue Fin Coil: Cold‑climate protection and corrosion resistance. 

• Quiet Operation: Indoor sound as low as 23 dB(A).

• Advanced Controls: kumo cloud®, wired/wireless remotes, thermostat interface. 

Specifications (Rated Conditions)

Cooling Capacity: 12,000 BTU
Heating Capacity: Rated 15,000 BTU (max 18,000 BTU) 
Electrical: 208/230 V · 1‑Ph · 60 Hz 
Indoor Sound: 23 – 33 dB(A) 
Piping: Liquid ¼ " | Gas ⅜ " | Max length 100 ft | Max height 50 ft 
Outdoor Dimensions / Weight: 33‑1/16 " W × 13 " D × 34‑5/8 " H · 115 lb 

Included Components

Indoor Unit: SEZ‑AD12NL horizontal ducted air handler
Outdoor Unit: SUZ‑AA12NLHZ Hyper‑Heating condenser

Ideal For

Homeowners or small‑business owners who need a quiet, energy‑efficient, cold‑climate ducted solution for single zones such as master bedrooms, studios, or office suites. Enjoy hidden installation, Hyper‑Heat performance, and remote control convenience backed by Mitsubishi’s warranty.