Mitsubishi MSY-GX18NL & MUY-GX18NL 18,000 BTU 22.5 SEER2 Wall Mounted Cooling Only System - R454B - MSYGX18NL/MUYGX18NL
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 STARperformance 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.
Features
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INVERTER Technology: Variable‑speed compressor for precise, energy‑saving output
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Low‑Ambient Cooling: Maintains full cooling to 14 °F; operates to ‑1 °F restart threshold
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Quiet Operation: Indoor sound as low as 28 dB(A); outdoor ≈ 54 dB(A)
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Dual Barrier & Blue Fin Coatings: Resist dust, oil, and coastal corrosion
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Washable Nano‑Platinum Filter: Long‑life filtration with easy cleaning
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Built‑in Wi‑Fi: Comfort‑app, wired, or wireless controller compatibility
What Our Experts Think
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18,000 BTU wall-mounted cooling-only system ideal for single-zone spaces up to ~750 sq ft.
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Slim design blends seamlessly into any room while providing whisper-quiet operation.
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ENERGY STAR-rated with INVERTER technology for high-efficiency cooling and precise temperature control.
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Dual Barrier and Blue Fin coatings protect coils from corrosion and debris.
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Wi-Fi enabled and back-lit remote offer convenient, flexible control.
Q&A
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Q: What room size is suitable for this system?
A: Ideal for rooms up to ~750 sq ft.
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Q: Is it energy-efficient?
A: Yes, 22.5 SEER2 rating with INVERTER technology ensures low energy consumption.
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Q: Can it operate in cold outdoor temperatures?
A: Yes, designed to function efficiently down to –1 °F.
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Q: Does it include smart control features?
A: Yes, built-in Wi-Fi compatible with Comfort App and comes with a back-lit remote.
Maintenance Tips
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Clean or replace filters monthly to maintain airflow and efficiency.
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Schedule annual professional maintenance for refrigerant and system performance.
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Keep outdoor condenser clear of debris.
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Inspect wall unit and mounting periodically for stability.
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Ensure condensate lines remain unobstructed to prevent water damage.
