Mitsubishi SEZ-AD12NL & SUZ-AA12NLHZ 12,000 BTU 16.2 SEER2 Horizontal Ducted Hyper Heat System - R454B - SEZAD12NL/SUZAA12NLHZ
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 STARcertification 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 cloudapp.
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.
What Our Experts Think
-
12,000 BTU horizontal-ducted Hyper Heat system ideal for single-zone spaces like bedrooms, basement suites, or boutique retail.
-
Hyper-Heating INVERTER (H2i) delivers full-rated heat at 5 °F and reliable operation down to –13 °F.
-
Quiet, discreet ducted design provides invisible year-round comfort.
-
Blue Fin anti-corrosion coating and R454B refrigerant ensure efficiency and long-term durability.
-
Perfect for energy-conscious users seeking reliable cold-climate heating.
Q&A
-
Q: What size room is suitable for this system?
A: Ideal for small to medium single-zone spaces up to ~600–700 sq ft.
-
Q: Can it heat efficiently in cold climates?
A: Yes, maintains full-rated heating down to –13 °F.
-
Q: Where can it be installed?
A: Horizontal-ducted layout for attics, ceilings, or closets.
-
Q: What refrigerant is used?
A: R454B, a low-GWP, environmentally friendly refrigerant.
Maintenance Tips
-
Clean or replace filters monthly to maintain airflow and efficiency.
-
Schedule annual professional maintenance for refrigerant and system performance.
-
Keep outdoor unit free of debris to ensure optimal operation.
-
Inspect ductwork and connections periodically for leaks.
-
Ensure condensate lines remain clear to prevent water damage.
