Mitsubishi MSZ-GX12NL & MUZ-GX12NLHZ 25.6 SEER2 Wall Mounted Hyper Heating Heat Pump System - R454B

Mitsubishi MSZ‑GX12NL & MUZ‑GX12NLHZ: 12,000 BTU Wall‑Mounted Hyper Heat Pump System

The Mitsubishi MSZ‑GX12NL, paired with the MUZ‑GX12NLHZ outdoor unit, delivers efficient and reliable heating and cooling in a sleek 12,000 BTU ductless mini-split system. Ideal for medium rooms up to 500 sq ft, this single-zone heat pump is perfect for living rooms, bedrooms, or home offices requiring quiet, consistent comfort.

Equipped with advanced INVERTER-driven compressor technology and eco-friendly R‑454B refrigerant, the system provides precise temperature control and energy-efficient operation. The MSZ indoor unit features a low-profile design for unobtrusive wall mounting, while the MUZ outdoor condenser includes Hyper‑Heat technology for dependable heating in cold climates.

With whisper-quiet sound levels, built-in Wi-Fi for remote management, and advanced filtration, the MSZ‑GX12NL & MUZ‑GX12NLHZ offers a smart, space-saving comfort solution.

General Information
System Type: Wall-mounted ductless air handler + single-zone hyper heat pump condenser
Models: Indoor – MSZ‑GX12NL | Outdoor – MUZ‑GX12NLHZ
Capacities: 14,000 BTU Cooling | 19,100 Heating
Room Size: Ideal for 500 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R‑454B, 2.20 lb

Key Features

• INVERTER Technology: Provides precise, energy-saving performance

• Hyper‑Heat Cold Climate Performance: Reliable heating down to -13°F outdoor temps

• Space‑Saving Design: Compact wall unit perfect for medium rooms

• Quiet Operation: Indoor sound levels as low as 20 dB(A)

• Washable Filter: Easy maintenance with reusable air filter

• Built-In Wi-Fi: Integrated wireless control via the Mitsubishi Comfort app

Specifications (Rated Conditions)
Cooling Capacity: 14,000 | EER2: 13.35 | SEER2: 25.6
Heating Capacity @ 47°F: 12,300 | HSPF2: 10 | COP (47°F): 3.92
Heating Capacity @ 5°F: Up to 12,300
Electrical: 208/230 V, 1-Ph, 60 Hz
Airflow (Dry): 136-448 CFM (cool & heat)
Sound Pressure: Indoor 19-45 dB(A) | Outdoor 49-51 dB(A)
Piping: Liquid 1/4 in. | Gas 3/8 in. | Max line length: 65 ft | Max height: 40 ft
Outdoor Dimensions / Weight: 31-1/2 x 11-1/4 x 21-5/8 in. | 82 lb
Drain Connection: 5/8 in. O.D.

Included Components

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

• Outdoor Unit: MUZ‑GX12NLHZ Hyper‑Heat heat pump condenser

Ideal For
Homeowners and contractors seeking a quiet, high-efficiency ductless system for medium spaces. The MSZ‑GX12NL & MUZ‑GX12NLHZ offers reliable year-round comfort, smart control, and energy-efficient operation in a compact design.