Mitsubishi MSZ-EX18NLS & SUZ-AA18NLHZ 18,000 BTU 17.5 SEER2 Wall Mounted Hyper Heat Pump System – R454B

Mitsubishi MSZ‑EX18NLS & SUZ‑AA18NLHZ: 18,000 BTU Wall‑Mounted Hyper‑Heat Pump System

The Mitsubishi MSZ‑EX18NLS indoor unit paired with the SUZ‑AA18NLHZ outdoor condenser delivers efficient 16,400 BTU cooling and powerful 20,000 BTU Hyper‑Heating output. Designed as a single‑zone package—but with an EX‑series head that can also join multi‑zone builds—this inverter‑driven mini‑split provides whisper‑quiet, year‑round comfort for rooms up to 750 sq ft, maintaining 100 % heating capacity at 5 °F and reliable operation down to ‑22.5 °F thanks to a factory‑installed base‑pan heater. It runs on low‑GWP R‑454B refrigerant for a greener footprint. 

Note: This system is not compatible with Mitsubishi “smart” outdoor platforms.

General Information

System Type: Wall‑mounted ductless air handler + single‑zone Hyper‑Heat pump condenser
Models: Indoor – MSZ‑EX18NLS | Outdoor – SUZ‑AA18NLHZ
Capacities: 16,400 BTU Cooling | 20,000 BTU Heating (rated) 
Room Size: Ideal for up to 750 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes 
Refrigerant / Factory Charge: R‑454B, pre‑charged 

Key Features

INVERTER Technology: Variable‑speed compressor for energy‑efficient, responsive performance
Hyper‑Heating Performance: Maintains 100 % heating capacity at 5 °F; reliable heat to  -22.5 °F
Single‑ or Multi‑Zone Flexibility: EX indoor unit supports single‑zone installs and multi‑zone expansion
Base‑Pan Heater: Factory‑installed to prevent ice buildup in frigid conditions 
Dual Barrier Coating & Advanced Filtration: Protects coil and improves indoor air quality 
Quiet Operation: Indoor sound levels as low as 30 dB(A) for discreet comfort 
Smart Control Ready: Works with wireless/wired remotes and Mitsubishi Comfort app

Specifications (Rated Conditions)

Cooling Capacity: 16,400 BTU | EER2: 11.7 | SEER2: 17.5 
Heating Capacity @ 47 °F: 20,000 BTU | HSPF2: 10.2 | COP (47 °F): 3.4 
Heating Capacity @ 5 °F: 20,000 BTU (100 %) 
Electrical: 208/230 V | 1‑Ph | 60 Hz
Airflow (Dry): 208 – 497 CFM
Sound Pressure: Indoor 30 – 49 dB(A) | Outdoor 55 dB(A) 
Piping: Liquid ¼ in. | Gas ½ in. | Max line length 100 ft | Max height 50 ft 
Outdoor Dimensions / Weight: 33‑1/16 × 13 × 34‑5/8 in. | 115 lb
Drain Connection: ⅝ in. O.D.

Included Components

Indoor Unit: MSZ‑EX18NLS wall‑mounted air handler
Outdoor Unit: SUZ‑AA18NLHZ Hyper‑Heat condenser
Hand‑held IR Remote Controller

Ideal For

Homeowners and contractors needing a cold‑climate mini‑split for medium‑to‑large rooms. This system delivers efficient cooling and Hyper‑Heating today while leaving the door open for multi‑zone integration—without the complexity of Mitsubishi’s smart outdoor platforms.