Mitsubishi MLZ-KX09NL & SUZ-AA09NL 9,000 BTU 21.6 SEER2 One-Way Ceiling Cassette Heat Pump System (w/ Grille) - R454B - MLZKX09NL/MLP449WU/SUZAA09NL
The Mitsubishi MLZ-KX09NL & SUZ-AA09NL is a high-efficiency 9,000 BTU heat pump system featuring a sleek, one-way ceiling cassette indoor unit. Engineered for discreet ceiling-mounted installation, this system is ideal for rooms where wall or floor space is limited. The compact MLZ-KX09NL blends seamlessly into shallow ceiling cavities, while the SUZ-AA09NL outdoor unit offers reliable and quiet year-round performance with INVERTER technology, Blue Fin anti-corrosion protection, and advanced energy-saving features.
Perfect for single-zone applications in residential or light commercial settings, this system delivers whisper-quiet comfort, customizable airflow direction, and smart control capabilities including Wi-Fi compatibility via the Mitsubishi Comfort app.
General Information
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System Type: One-Way Ceiling Cassette Heat Pump System
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Model Numbers: Indoor – MLZ-KX09NL / Outdoor – SUZ-AA09NL
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Capacity: 9,000 BTU Cooling / 12,000 BTU Heating
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Room Size: Ideal for spaces up to ~350 sq ft
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Operating Mode: Heating & Cooling
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Energy Star Certified: Yes
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Refrigerant: R454B (1 lb, 11.83 oz)
Features
INVERTER-Driven Compressor
Adjusts output dynamically to maintain stable temperatures while reducing energy usage.
Slim Ceiling Cassette Design
Low-profile indoor unit fits between standard 16" joists—ideal for retrofits and tight attic installations.
Quiet Operation
Designed for ultra-quiet indoor and outdoor performance to maintain peaceful environments.
4-Speed Fan with Auto Mode
Offers variable fan speeds for customizable comfort and efficient air distribution.
Horizontal Airflow
One-way directional airflow offers better room coverage than traditional wall-mounted units.
Blue Fin Anti-Corrosion Coating
Enhances durability of the outdoor unit, particularly in coastal or harsh weather environments.
Powerful Mode
Rapidly cools or heats by temporarily maximizing fan speed and compressor output.
Auto Restart Function
Resumes operation automatically after power outages, maintaining user settings.
Wi-Fi & Smart Controls
Compatible with Mitsubishi Comfort app, wired/wireless controllers, and third-party smart home systems.
Optional i-see Sensor
Enhances comfort with intelligent occupancy-based temperature adjustment (sold separately).
What Our Experts Think
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Ultra‑efficient Performance: With a 21.6 SEER2 rating and INVERTER-driven outdoor unit, this system delivers strong cooling and heating while keeping energy consumption low.
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Discrete Ceiling Installation: The slim one‑way ceiling cassette blends seamlessly into shallow ceiling cavities, ideal when wall or floor space is limited.
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All‑Season Reliability: Heat‑pump design provides true heating in winter and cooling in summer, reducing the need for separate systems.
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Durable Build: The outdoor compressor is protected with Blue Fin anti‑corrosion coating, extending its lifespan in harsh environments.
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Compact and Quiet: Both the indoor cassette and the outdoor unit operate with minimal noise, making it great for sleeping areas or offices.
Q&A
Q: What size room is this system ideal for?
A: At 9,000 BTU, it’s well suited for small to medium rooms (like bedrooms, offices, or compact living spaces).
Q: Will it keep me warm in winter?
A: Yes—thanks to the heat‑pump technology, it provides reliable heating down to moderate cold temperatures.
Q: Do I need wall space to install it?
A: No, since it’s a ceiling cassette, installation doesn’t require wall or floor space.
Q: How energy-efficient is it?
A: The 21.6 SEER2 rating ensures efficient operation, and the inverter compressor adjusts speed to match demand.
Q: Is the outdoor unit durable?
A: Yes, the SUZ‑AA09NL features Blue Fin anti‑corrosion protection to withstand the elements.
Maintenance Tips
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Clean Filters Regularly: Remove and clean the cassette’s air filters every 1–2 months to maintain airflow and efficiency.
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Check Drain Pan: Inspect and clean the condensate drain line to prevent clogs and leaks from the ceiling cassette.
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Maintain the Outdoor Unit: Keep the area around the outdoor unit clear of debris and foliage to ensure proper airflow.
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Annual Professional Service: Schedule a technician to verify refrigerant levels, inspect the coil, and tune the inverter system.
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Monitor Noise and Vibration: Listen periodically for abnormal sounds that may indicate mounting or balance issues.
