Mitsubishi MSZ-FX18NL & MUZ-FX18NLHZ 18,000 BTU 25.5 SEER2 Wall Mounted Hyper Heating Heat Pump System – R454B

Mitsubishi MSZ‑FX18NL & MUZ‑FX18NLHZ: 18,000 BTU Wall‑Mounted Hyper Heat Pump System

The Mitsubishi MSZ‑FX18NL, paired with the MUZ‑FX18NLHZ outdoor unit, delivers high-efficiency, year-round comfort in a sleek 18,000 BTU ductless mini-split system. Perfect for larger rooms up to 750 sq ft, this single-zone heat pump is ideal for living rooms, large bedrooms, or open spaces needing powerful performance and quiet operation.

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‑FX18NL & MUZ‑FX18NLHZ a smart, space-saving comfort solution.

General Information
System Type: Wall-mounted ductless air handler + single-zone hyper heat pump condenser
Models: Indoor – MSZ‑FX18NL | Outdoor – MUZ‑FX18NLHZ
Capacities: 21,500 Cooling | 30,200 Heating
Room Size: Ideal for 750 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: 21,500 | EER2: 13.05 | SEER2: 25.5
Heating Capacity @ 47°F: 30,200 | HSPF2: 11.1 | COP (47°F): 3.58
Heating Capacity @ 5°F: Up to 23,600
Electrical: 208/230 V, 1-Ph, 60 Hz 
Airflow (Dry): 231-614 CFM (cool & heat)
Sound Pressure: Indoor 26–46 dB(A) | Outdoor 52-53 dB(A)
Piping: Liquid 1/4 in. | Gas 3/8 in. | Max line length: 100 ft | Max height: 50 ft
Outdoor Dimensions / Weight: 33-1/16 x 13 x 34-5/8 in. | 119 lb
Drain Connection: 5/8 in. O.D.

Included Components

• Indoor Unit: MSZ‑FX18NL wall-mounted ductless air handler

• Outdoor Unit: MUZ‑FX18NLHZ Hyper‑Heat heat pump condenser

Ideal For
Homeowners and contractors seeking a quiet, high-performance ductless system for larger spaces. The MSZ‑FX18NL & MUZ‑FX18NLHZ offers reliable year-round comfort, smart control, and efficient operation in a minimal footprint.