Mitsubishi 18,000 BTU 20.1 SEER2 Horizontal-Ducted Cooling Only System - R454B - PEADAA18NL/PUYAK18NL
The Mitsubishi PEAD-AA18NL paired with the PUY-AK18NL outdoor unit delivers efficient, reliable cooling in an 18,000 BTU single-zone ducted system. Designed for rooms up to ~750 sq ft, it’s ideal for offices, server rooms, or spaces needing discreet, continuous cooling.
Featuring an INVERTER-driven compressor and low-ambient cooling down to -40°F with wind baffles, this system provides precise temperature control even in demanding conditions. The slim 9-7/8″ height indoor unit fits easily into tight ceiling cavities or soffits. Advanced Blue Fin and seacoast protection coatings safeguard the outdoor coil and components, ensuring long-lasting performance in coastal or industrial environments.
Enjoy quiet operation with indoor sound levels as low as 28 dB(A) and flexible control options including wired and wireless remotes, third-party thermostat interfaces, and full smartphone access via the Comfort app.
System Type: Ducted concealed indoor unit + single-zone cooling-only outdoor unit
Models: Indoor – PEAD-AA18NL | Outdoor – PUY-AK18NL
Capacities: 18,000 BTU Cooling | 4,700–18,500 BTU Range
Room Size: Ideal for ~750 sq ft
Operating Modes: Cooling Only (24-hour continuous operation)
ENERGY STAR: No
Refrigerant / Factory Charge: R-454B, 4.6 lb
Features
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INVERTER-Driven Compressor: Precise, efficient capacity control
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Low-Ambient Cooling: Operates down to -40°F with wind baffles
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Compact Design: Slim 9-7/8″ height for easy installation in tight spaces
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Quiet Operation: Indoor sound levels as low as 28 dB(A)
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Seacoast & Blue Fin Protection: Enhanced corrosion resistance for coastal areas
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Smart Controls: Compatible with Comfort app, wired & wireless remotes, third-party thermostats
What our Experts Think
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Quiet, Efficient Cooling Only: Designed for 18,000 BTU of cooling with a 20.1 SEER2 efficiency — ideal for larger living spaces, offices, or commercial areas needing reliable, continuous cooling.
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Discreet Ducted Installation: The horizontal‑ducted PEAD‑AA18NL indoor unit fits tight ceiling cavities or soffits, keeping the system hidden while delivering smooth airflow.
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Inverter‑Driven Precision: Advanced inverter compressor delivers precise temperature control, reducing power draw and stabilizing comfort.
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Low‑Noise Operation: Indoor sound levels can be as low as ~28 dB(A) — quiet enough for bedrooms, offices, or study areas.
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Smart Controls & Flexibility: Compatible with wired, wireless, third‑party thermostat interfaces, and Mitsubishi’s mobile app for convenient control.
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Durable, Weather‑Resistant Design: Outdoor unit features Blue Fin and seacoast protection coatings for enhanced resistance to corrosion and extended life in challenging environments.
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Perfect Fit for Discreet Cooling Projects: A strong choice where hidden ducted comfort and high efficiency matter most.
Q&A
Q: What is this Mitsubishi ducted cooling system?
A: A 18,000 BTU horizontal‑ducted cooling‑only system with 20.1 SEER2 efficiency, designed for efficient, quiet central cooling.
Q: What components are included?
A: PEAD‑AA18NL indoor horizontal ducted unit + PUY‑AK18NL outdoor cooling‑only condenser, using R454B refrigerant.
Q: What space size is ideal?
A: Suitable for 800–1,100 sq ft, depending on insulation, duct design, and layout.
Q: Is this a heat pump system?
A: No — this model is cooling‑only, perfect for spaces where dedicated cooling is needed without heating.
Q: What makes this system special?
A: High SEER2 efficiency, quiet operation, and discreet ducted installation for uniform cooling.
Q: Is professional installation required?
A: Yes, professional HVAC installation ensures correct airflow, optimal performance, and warranty compliance.
Q: Why choose this Mitsubishi system?
A: Offers energy‑efficient cooling, flexible ducted placement, and reliable performance for homes and commercial applications.
Maintenance Tips
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Clean Air Filters Monthly – Ensures proper airflow and maintains peak cooling efficiency.
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Inspect Condensate Drain & Pan – Prevents clogs, leaks, and water damage.
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Keep Outdoor Unit Clear – Remove leaves, dirt, and debris for optimal heat exchange.
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Check Refrigerant Levels – Low refrigerant reduces cooling performance; contact a licensed technician if needed.
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Inspect Fans & Coils – Clean dust buildup to maintain smooth operation.
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Schedule Annual Professional Service – Deep clean coils, check electrical connections, and test system performance
Damage 
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