Mitsubishi MLZ-KX12NL & SUZ-AA12NLHZ 12,000 BTU 16.7 SEER2 One-Way Ceiling Cassette Hyper Heating Heat Pump System (w/ Grille) - R454B

Mitsubishi MLZ-KX12NL & SUZ-AA12NLHZ: 12,000 BTU Ceiling-Cassette Hyper-Heating Heat Pump System

The Mitsubishi MLZ-KX12NL & SUZ-AA12NLHZ is a powerful, 12,000 BTU 1-way ceiling cassette heat pump system built for discreet, high-efficiency comfort in residential and light commercial applications. With Hyper-Heating INVERTER® (H2i®) technology, it delivers full-rated heating at 5°F and reliable performance in temperatures as low as -13°F. The MLZ-KX12NL indoor cassette installs flush between standard 16" joists for a low-profile, grille-only ceiling appearance, while the SUZ-AA12NLHZ outdoor unit offers inverter-driven performance with Blue Fin coil protection for added durability.

Perfect for medium-sized rooms up to ~500 sq ft, this single-zone system delivers quiet operation, customizable airflow, energy savings, and smart control integration—all in a sleek, ceiling-mounted package.

General Information

System Type: 1-Way Ceiling Cassette Indoor Unit + Hyper-Heating Outdoor Unit
Model Numbers: Indoor – MLZ-KX12NL / Outdoor – SUZ-AA12NLHZ
Capacity: 12,000 BTU Cooling / 15,000 BTU Hyper-Heating (Up to 18,000 BTU)
Ideal Room Size: ~500 sq ft
Operating Mode: Heating & Cooling
Energy Star Certified: Yes
Refrigerant: R454B (Factory-charged)

Key Features

Hyper-Heating INVERTER® (H2i®) Technology
Full heating capacity at 5°F; dependable operation at -13°F outdoor temperatures.

EZ FIT Ceiling Installation
Slim indoor unit fits between 16" ceiling joists for a flush, low-profile appearance.

Built-in 19.6" Condensate Lift Pump
Simplifies drainage and ceiling installation.

Whisper-Quiet Operation
Indoor noise levels as low as 28 dB(A) for quiet comfort.

Blue Fin Coating
Protects outdoor coil from corrosion in harsh climates.

Advanced Filtration
Includes antibacterial and deodorizing washable filters.

Smart Comfort Control
Supports Mitsubishi’s Comfort app, handheld remote, and wired controller options.

Auto Vane & Hot-Start
Prevents drafts and delivers smooth, efficient air distribution.

Specifications

Cooling Capacity: 12,000 BTU 
Heating Capacity: 15,000 BTU Rated / Up to 18,000 BTU
EER2: 13.3
HSPF2: 9.6
COP @ 47°F: 3.3
COP @ 17°F: 2.2
Voltage: 208/230V, 1-Phase, 60Hz
Airflow Rate: 212-332 CFM (Cooling)
Indoor Sound Levels: 27-40 dB(A) (Cooling), 26-40 dB(A) (Heating)
Piping: 3/8 in. (Gas) / 1/4 in. (Liquid)

Included Components

Indoor Unit: MLZ-KX12NL
Grille: MLP-449W
Outdoor Unit: SUZ-AA12NLHZ
Controller: Hand-held IR Remote

Optional Accessories

Indoor Unit: Wi-Fi Interface, Wired Wall Controller, Enhanced Air Filter, CN24 Relay Kit
Outdoor Unit: Base Pan Heater, Drain Socket, Wall-Mount Bracket, Air Outlet Guide

Ideal For:
Homeowners or business owners looking for a clean, ceiling-mounted hyper-heating solution that’s quiet, efficient, and smart-controlled—perfect for spaces up to 500 sq ft in any season