Mitsubishi SLZ-AF12NL & SUZ-AA12NLHZ 12,000 BTU 16.8 SEER2 Four-Way Ceiling Cassette Hyper Heating Heat Pump System (w/ Standard Grille) - R454B

Mitsubishi SLZ‑AF12NL & SUZ‑AA12NLHZ: 12,000 BTU Ceiling‑Cassette Hyper‑Heating System

The Mitsubishi SLZ‑AF12NL 4‑way ceiling cassette, combined with the cold‑climate SUZ‑AA12NLHZ Hyper‑Heating outdoor condenser, forms a 12 k BTU single‑zone system designed for efficient year‑round performance in colder regions. It features R454B refrigerant, INVERTER-driven operation, and Pulse-Amplitude Modulation (PAM) control to deliver responsive heating and cooling even in subfreezing temperatures.

Ideal for spaces around 500 sq ft, the system includes the required SLP‑18FAU decorative grille, offers ultra-quiet operation, and comes Wi‑Fi ready for seamless app-based control via the Mitsubishi Comfort Cloud. The 4‑way airflow design ensures even temperature distribution, while built‑in features like a 33" condensate lift pump and Blue Fin coating increase reliability and installation flexibility.

General Information

System Type: 4‑way ceiling cassette + single‑zone Hyper‑Heating heat‑pump condenser
Models: Indoor – SLZ‑AF12NL (+ SLP‑18FAU grille) | Outdoor – SUZ‑AA12NLHZ
Capacities: 12 k BTU Cooling | 15 k BTU Heating 
Room Size: Ideal for ~500 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes (SEER2 16.8, HSPF2 9.4)
Refrigerant / Factory Charge: R454B, 2 lb 6 oz

Key Features

Hyper‑Heating INVERTER® Technology – Delivers reliable heating at outdoor temps as low as –13°F.
4‑Way Vane Control – Even air distribution in all directions.
Built‑In 33" Lift Pump – Enables flexible drain line placement above ceiling level.
Wi‑Fi Built‑In – Remote control and scheduling through the Mitsubishi Comfort Cloud app.
Ultra‑Quiet Operation – Indoor sound as low as 25 dB(A), outdoor max 52 dB(A).
Blue Fin Anti‑Corrosion Coating – Protects outdoor coil from environmental damage.
Fresh‑Air Intake Option – For enhanced air quality and ventilation.
3D i‑see Sensor® Compatibility – Optional occupancy and thermal sensing for smarter comfort.
Hot‑Start Technology – Prevents cold air drafts on heat startup.
High‑Efficiency Heat Exchanger – Boosts seasonal performance in variable climates.

Specifications (Rated Conditions)

Cooling Capacity: 12,000 BTU | EER2: 13.9 | SEER2: 16.8
Heating Capacity @47°F: 15,000 BTU | HSPF2: 9.4 | COP (47°F): 3.4
Heating Capacity @5°F: Up to 15,000 BTU
Electrical: 208/230 V 1‑Ph 60 Hz | MCA: 14 A | MOCP: 20 A
Airflow (Dry): 230-335CFM (cool & heat)
Sound Pressure: Indoor 25–34 dB(A) | Outdoor 54-55dB(A)
Piping: Liquid ¼ in. | Gas ⅜ in. | Max length 65 ft | Max height 40 ft
Outdoor Dimensions / Weight: 33-1/16 x 13 x 34-11/16 in. | 115 lb
Drain Connection: ¾ in. O.D.

Included Components

Indoor Unit: SLZ‑AF12NL ceiling cassette
Decorative Grille: SLP‑18FAU (required)
Outdoor Unit: SUZ‑AA12NLHZ Hyper‑Heating condenser

Ideal For

Homeowners or business owners seeking a reliable and whisper-quiet ceiling-mounted mini-split for bedrooms, home offices, or small commercial suites—especially in cold climates. The SLZ‑AF12NL & SUZ‑AA12NLHZ pair offers ENERGY STAR® efficiency, app-based remote control, and steady heating down to –13°F.