Mitsubishi MSZ-GX12NL & MUZ-GX12NL 25.6 SEER2 Wall Mounted Heat Pump System - R454B

Mitsubishi MSZ-GX12NL & MUZ-GX12NL: 12,000 BTU Wall-Mounted Heat Pump System

The Mitsubishi MSZ-GX12NL indoor unit, paired with the MUZ-GX12NL outdoor condenser, delivers efficient 12,000 BTU heating and cooling in a compact single-zone mini-split. Designed for rooms up to 500 sq ft, it’s an ideal choice for bedrooms, offices, and medium living spaces that demand quiet, consistent comfort.

Driven by an INVERTER compressor and eco-friendly R-454B refrigerant, the system maintains precise temperatures with minimal energy use. The slim indoor unit mounts cleanly on the wall, while Blue Fin and Dual Barrier coatings help keep internal components clean and corrosion-free for lasting efficiency.

Whisper-quiet sound levels, built-in Wi-Fi control, and advanced filtration make the MSZ-GX12NL & MUZ-GX12NL a smart, low-maintenance solution for year-round comfort.

General Information
System Type: Wall-mounted ductless air handler + single-zone heat pump condenser
Models: Indoor – MSZ-GX12NL | Outdoor – MUZ-GX12NL
Capacities: 12,000 BTU Cooling | 14,400 BTU Heating
Room Size: Ideal for 500 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R-454B, 2.0 lb

Key Features

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

• All-Climate Heating: Delivers reliable warmth down to 5 °F outdoor temps

• Space-Saving Design: Low-profile wall unit blends seamlessly into décor

• Quiet Operation: Indoor sound as low as 19 dB(A) for minimal disruption

• Washable Electrostatic Enzyme Filter: Traps dust and allergens; easy to clean

• Built-In Wi-Fi: Control settings remotely with the Mitsubishi Comfort app

Specifications (Rated Conditions)
Cooling Capacity: 12,000 BTU | EER2: 13.35 | SEER2: 25.6
Heating Capacity @ 47 °F: 14,400 BTU | HSPF2: 10.7 | COP (47 °F): 3.84
Heating Capacity @ 5 °F: Up to 10,100 BTU
Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 12 A | MOCP: 20 A
Airflow (Dry): 151–448 CFM (cool & heat)
Sound Pressure: Indoor 19–45 dB(A) | Outdoor 49–51 dB(A)
Piping: Liquid ¼ in. | Gas ⅜ in. | Max line length: 65 ft | Max height: 40 ft
Outdoor Dimensions / Weight: 31 ½ × 11 ¼ × 21 ⅝ in. | 77 lb
Drain Connection: ⅝ in. O.D.

Included Components

• Indoor Unit: MSZ-GX12NL wall-mounted ductless air handler

• Outdoor Unit: MUZ-GX12NL heat pump condenser

• Back-lit Hand-Held Remote Controller

Ideal For
Homeowners and contractors who need a quiet, energy-efficient ductless system for medium-sized rooms. The MSZ-GX12NL & MUZ-GX12NL provide dependable heating, efficient cooling, and smart control in a sleek, space-saving package.