Mitsubishi MSZ-WX12NL & MUZ-WX12NL 12,000 BTU 18 SEER2 Wall Mounted Heat Pump System - R454B - MSZWX12NL/MUZWX12NL
The Mitsubishi MSZ-WX12NL indoor unit, paired with the MUZ-WX12NL outdoor condenser, delivers efficient 12,000 BTU heating and cooling in a compact, single-zone ductless mini-split system. Engineered for rooms up to 500 sq ft, this unit features Heating INVERTER technology for reliable performance in extreme cold, maintaining warmth down to -13°F outdoor temperatures.
This ENERGY STAR certified system uses environmentally friendly R-454B refrigerant and features a sleek, wall-mounted design with a built-in washable filter and whisper-quiet operation. Built-in Wi-Fi and advanced smart control compatibility provide flexible remote access and temperature scheduling.
Key Features
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INVERTER Technology: Precise, energy-saving heating and cooling
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Heat Performance: Delivers warmth in extreme cold, down to -13°F
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Compact Design: Slim indoor unit fits tight spaces and blends into decor
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Quiet Operation: Indoor sound levels as low as 22 dB(A)
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Washable Filter: Long-lasting, easy-to-clean air filtration
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Built-In Wi-Fi: Compatible with Comfort app, wired and wireless controllers
What Our Experts Think
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Cold-Climate Ready: Heating INVERTER technology keeps your space warm even down to -13°F outdoors.
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Energy Efficient: 18 SEER2 rating ensures strong cooling performance with reduced energy consumption.
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Compact & Stylish: Wall-mounted indoor unit fits rooms up to 500 sq ft without occupying floor space.
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Durable Build: Designed to handle extreme cold and provide long-lasting performance.
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Quiet Operation: Indoor noise levels are low for comfortable, unobtrusive heating and cooling.
Q & A
Q: What is the system’s capacity?
A: 12,000 BTU for cooling and efficient heating output for rooms up to ~500 sq ft.
Q: What refrigerant does it use?
A: R‑454B, an eco-friendly refrigerant with lower global warming potential.
Q: How low can it operate in heating mode?
A: Effective heating down to -13°F outdoor temperature.
Q: Is this system suitable for small rooms?
A: Yes, ideal for single-zone applications up to 500 sq ft.
Q: Does it require professional installation?
A: Yes, professional installation is recommended to ensure proper operation and warranty compliance.
Maintenance Tips
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Clean or wash the indoor air filter regularly to maintain airflow and efficiency.
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Keep the outdoor unit free from snow, leaves, and debris.
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Schedule annual professional servicing to check refrigerant levels and overall system performance.
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Use energy-saving modes when appropriate to reduce electricity consumption.
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Ensure the condensate drain line is unobstructed to prevent water buildup.
