Mitsubishi SLZ-AF18NL & SUZ-AA18NLHZ 18,000 BTU 17.5 SEER2 Four-Way Ceiling Cassette Hyper Heating Heat Pump System (w/ Standard Grille) - R454B

Mitsubishi SLZ‑AF18NL & SUZ‑AA18NLHZ: 18,000 BTU Ceiling‑Cassette Heat Pump System

The Mitsubishi SLZ‑AF18NL 4‑way ceiling cassette, paired with the SUZ‑AA18NLHZ Hyper‑Heating outdoor condenser, creates a high-efficiency 18 k BTU ductless mini-split system designed for comfortable heating and cooling in medium-sized spaces around 750 sq ft. Equipped with an INVERTER-driven compressor and R454B refrigerant, this system offers precise temperature control, enhanced cold-climate heating capacity, and quiet operation.

Included with the unit is the SLP‑18FAU decorative grille, providing a sleek ceiling installation with four-way airflow for even room temperature distribution. The system supports Wi-Fi control through Mitsubishi’s Comfort Cloud app for convenient remote operation and features Blue Fin anti-corrosion coating for durability in harsh environments.

General Information

System Type: 4‑way ceiling cassette + single‑zone hyper-heating heat-pump condenser
Models: Indoor – SLZ‑AF18NL (+ SLP‑18FAU grille) | Outdoor – SUZ‑AA18NLHZ
Capacities: 18 k BTU Cooling | 20 k BTU Heating 
Room Size: Ideal for ~750 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes (SEER2 17.5, HSPF2 9.3)
Refrigerant / Factory Charge: R454B, 2 lb 8 oz

Key Features

INVERTER Compressor Technology – Provides efficient, precise climate control and energy savings.
Hyper-Heating Performance – Maintains higher heating capacity in colder temperatures.
4‑Way Airflow Design – Delivers balanced and uniform air distribution for enhanced comfort.
Ultra‑Quiet Operation – Indoor noise levels as low as 27 dB(A); outdoor unit at 54 dB(A).
Wi‑Fi Ready – Compatible with Mitsubishi Comfort Cloud app for smart remote access.
Compact Ceiling Design – Flush-mounted with decorative grille for seamless integration.
Blue Fin Anti‑Corrosion Coating – Protects outdoor coil from harsh environments.
Hot‑Start Technology – Eliminates cold drafts during heating startup.
Optional Fresh‑Air Intake – Enhances indoor air quality by allowing ventilation.

Specifications (Rated Conditions)

Cooling Capacity: 18,000 BTU | EER2: 12 | SEER2: 17.5
Heating Capacity @17°F: 13,200 BTU | HSPF2: 9.3 | COP (17°F): 3.1
Electrical: 208/230 V 1‑Ph 60 Hz | MCA: 16 A | MOCP: 20 A
Airflow (Dry): 300-475 CFM (cool & heat)
Sound Pressure: Indoor 32-43 dB(A) | Outdoor 54-55 dB(A)
Piping: Liquid ¼ in. | Gas ½ 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‑AF18NL ceiling cassette
Decorative Grille: SLP‑18FAU (required)
Outdoor Unit: SUZ‑AA18NLHZ hyper-heating condenser

Ideal For

Homeowners or businesses needing a quiet, energy-efficient ceiling cassette system for medium spaces with superior cold-climate heating and smart app control.