Mitsubishi MSZ-FX12NL & MUZ-FX12NLHZ 12,000 BTU 29.9 SEER2 Wall Mounted Hyper-Heating Heat Pump System - R454B

Mitsubishi MSZ‑FX12NL & MUZ‑FX12NLHZ: 12,000 BTU Wall‑Mounted Hyper Heat Pump System

The Mitsubishi MSZ‑FX12NL, paired with the MUZ‑FX12NLHZ outdoor unit, delivers high-efficiency, year-round comfort in a sleek 12,000 BTU ductless mini-split system. Perfect for medium-sized rooms up to 500 sq ft, this single-zone heat pump is ideal for living rooms, bedrooms, or home offices where powerful performance and quiet operation are key.

Equipped with INVERTER-driven compressor technology and environmentally-friendly R‑454B refrigerant, this system ensures precise temperature control with ultra-low energy usage. The MSZ indoor unit features a modern, low-profile design for easy wall mounting, while the MUZ outdoor condenser includes Hyper‑Heat technology for dependable heating in extreme cold climates.

Whisper-quiet sound levels, integrated Wi-Fi for remote control, and advanced filtration make the MSZ‑FX12NL & MUZ‑FX12NLHZ a smart, space-saving comfort solution.

General Information
System Type: Wall-mounted ductless air handler + single-zone hyper heat pump condenser
Models: Indoor – MSZ‑FX12NL | Outdoor – MUZ‑FX12NLHZ
Capacities: 12,000 BTU Cooling | 16,000 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: Delivers precise, energy-saving performance

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

• Space‑Saving Design: Sleek wall unit blends seamlessly into living areas

• Quiet Operation: Indoor sound as low as 20 dB(A) for minimal disruption

• 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: 12,000 | EER2: 15.4 | SEER2: 29.9
Heating Capacity @ 47°F: 23,500 | HSPF2: 13 | COP (47°F): 4.88
Heating Capacity @ 5°F: Up to 18,200
Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 6 A | MOCP: 15 A
Airflow (Dry): 177–526 CFM (cool & heat)
Sound Pressure: Indoor 20–44 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 28-1/8 in. | 89 lb
Drain Connection: 5/8 in. O.D.

Included Components

• Indoor Unit: MSZ‑FX12NL wall-mounted ductless air handler

• Outdoor Unit: MUZ‑FX12NLHZ Hyper‑Heat heat pump condenser

Ideal For
Homeowners and contractors seeking a quiet, high-performance ductless system for medium spaces. The MSZ‑FX12NL & MUZ‑FX12NLHZ offers reliable year-round comfort, smart control, and efficient operation in a minimal footprint.