Mitsubishi MSY-GX18NL & MUY-GX18NL 18,000 BTU 22.5 SEER2 Wall Mounted Cooling Only System - R454B

Mitsubishi MSY‑GX18NL & MUY‑GX18NL: 18,000 BTU Wall‑Mounted Cooling‑Only System

The MSY‑GX18NL indoor unit, matched with the MUY‑GX18NL condenser, delivers 18,000 BTU of high‑efficiency, single‑zone cooling. Sized for rooms up to 750 sq ft, it combines INVERTER precision, whisper‑quiet operation, and ENERGY STAR® performance in a slim wall‑mount design. Dual Barrier and Blue Fin coatings keep coils clean and corrosion‑free, while built‑in Wi‑Fi (Comfort‑app ready) and a back‑lit remote give flexible control—even when outdoor temps fall to ‑1 °F.

General Information

System Type: Wall‑mounted ductless air handler + single‑zone cooling‑only condenser
Models: Indoor – MSY‑GX18NL | Outdoor – MUY‑GX18NL
Capacities: 18,000 BTU Cooling (22,000 BTU Max)
Room Size: Ideal for  750 sq ft
Operating Modes: Cooling
ENERGY STAR®: Yes
Refrigerant / Charge: R‑454B, 3 lb 12 oz

Key Features

• INVERTER Technology: Variable‑speed compressor for precise, energy‑saving output

• Low‑Ambient Cooling: Maintains full cooling to 14 °F; operates to ‑1 °F restart threshold

• Quiet Operation: Indoor sound as low as 28 dB(A); outdoor ≈ 54 dB(A)

• Dual Barrier & Blue Fin Coatings: Resist dust, oil, and coastal corrosion

• Washable Nano‑Platinum Filter: Long‑life filtration with easy cleaning

• Built‑in Wi‑Fi: Comfort‑app, wired, or wireless controller compatibility

Specifications (Rated Conditions)

Cooling Capacity: 18,000 BTU | EER2 14.05 | SEER2 22.5
Electrical: 208/230 V, 1‑Ph, 60 Hz | Outdoor breaker 25 A
Airflow (Dry): 324 – 650 CFM
Sound Pressure: Indoor 28–49 dB(A) | Outdoor 54 dB(A)
Piping: Liquid ¼ in.  |  Gas ½ in.  |  Max length 100 ft  |  Max height 50 ft 
Outdoor Dimensions / Weight:  33‑1/16 × 13 × 34‑5/8 in. | 116 lb
Drain Connection: ⅝ in. O.D.

Included Components

• Indoor Unit: MSY‑GX18NL wall‑mounted air handler

• Outdoor Unit: MUY‑GX18NL cooling‑only condenser

• Back‑lit Hand‑Held Remote Controller

Ideal For

Homeowners or contractors needing quiet, energy‑efficient cooling for large bedrooms, bonus rooms, or open living areas. The MSY‑GX18NL & MUY‑GX18NL deliver dependable performance, smart control, and low maintenance in a compact, elegant package.