Mitsubishi SEZ-AD18NL & SUZ-AA18NLHZ 18,000 BTU 17 SEER2 Horizontal Ducted Hyper Heat System - R454B

Mitsubishi SEZ‑AD18NL & SUZ‑AA18NLHZ: 18,000 BTU Hyper‑Heating Ducted Concealed Heat‑Pump System

The Mitsubishi SEZ‑AD18NL ducted concealed indoor unit combined with the SUZ‑AA18NLHZ Hyper‑Heating (H2i®) outdoor condenser forms a high-performance 18,000 BTU single-zone heat-pump system designed for year-round comfort—even in extreme climates. This system is ideal for large bedrooms, family rooms, open living spaces, and commercial offices requiring consistent heating and cooling with minimal visibility. Featuring Mitsubishi’s Hyper‑Heating INVERTER® technology, it delivers 100% of rated heating capacity at 5°F and reliable performance down to –13°F, making it a smart choice for cold-weather regions.

At only 7-7/8" high, the SEZ‑AD18NL fits discreetly in ceiling cavities, soffits, or closets. The unit includes a built-in 21" lift condensate pump for simplified drainage in tight installations. Quiet indoor operation—starting at just 30 dB(A)—ensures a peaceful environment, while the Blue Fin anti-corrosion coating protects the outdoor coil from moisture and environmental wear.

This ENERGY STAR® certified system provides heating and cooling for spaces up to 750 sq ft with top-tier seasonal performance and compatibility with advanced control options. Use wired or wireless remote controllers, integrate with third-party thermostats, or manage your system remotely via the kumo cloud® app for maximum convenience.

General Information

System Type: Concealed ducted indoor unit + Hyper‑Heat single-zone heat-pump condenser
Models: Indoor – SEZ‑AD18NL | Outdoor – SUZ‑AA18NLHZ
Capacities: 18,000 BTU Cooling | up to 22,000 BTU Heating (rated 18,000 BTU at 5°F)
Room Size: Ideal for ~750 sq ft
Operating Range: Cooling: 14°F – 115°F | Heating: –13°F – 75°F
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R‑454B, approx. 3.5 lb

Key Features

• Hyper‑Heating INVERTER®: Delivers 100% heating at 5°F, heats down to –13°F

• INVERTER‑Driven Compressor: Provides efficient, responsive comfort

• Ultra‑Slim 7-7/8" Design: Perfect for low-ceiling installs or soffits

• Quiet Operation: Indoor sound levels starting at 30 dB(A)

• Built-In 21" Drain Pump: Supports flexible installation and drainage

• Blue Fin Anti-Corrosion Coil: Extends outdoor unit life in harsh conditions

• Smart Controls: Compatible with Comfort App, wired/wireless remotes, and thermostats

Specifications (Rated Conditions)

Cooling Capacity: 18,000 BTU
Heating Capacity: Rated 18,000 BTU · Max 22,000 BTU
Electrical: 208/230 V · 1‑Ph · 60 Hz
Indoor Sound: 30–39 dB(A) (Low to High)
Piping: Liquid 1/4 in. | Gas 1/2 in. | Max length 100 ft | Max height 50 ft
Outdoor Dimensions / Weight: Approx. 33" W × 13" D × 34" H · ~125 lb

Included Components

• Indoor Unit: SEZ‑AD18NL horizontal ducted air handler

• Outdoor Unit: SUZ‑AA18NLHZ Hyper‑Heating condenser

Ideal For

Homeowners, contractors, or business owners looking for a quiet, hidden, and cold-climate-capable ducted system to condition single zones such as living rooms, basements, or studio spaces. This system delivers Hyper‑Heating performance, efficient operation, and flexible, smart control options.