Mitsubishi MSZ-JX12WL & MUZ-JX12WL 12,000 BTU 20 SEER Wall Mounted Heat Pump System - R454B

Mitsubishi MSZ‑JX12WL & MUZ‑JX12WL: 12,000 BTU Wall-Mounted Heat Pump System

The Mitsubishi MSZ‑JX12WL indoor unit, paired with the MUZ‑JX12WL 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 system features advanced inverter technology for reliable performance, maintaining warmth down to -5°F outdoor temperatures.

This system uses environmentally friendly low-GWP R‑454B refrigerant and features a sleek, wall-mounted design with a washable air filter and whisper-quiet operation. Compatible with optional Wi-Fi controls via Mitsubishi’s Wireless LAN module and the Comfort app, it provides flexible remote access and temperature scheduling.

General Information
System Type: Wall-mounted ductless air handler + single-zone heat pump condenser
Models: Indoor – MSZ‑JX12WL | Outdoor – MUZ‑JX12WL
Capacities: 12,000 BTU Cooling | 12,200 BTU Heating
Room Size: Ideal for 500 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R‑454B, approx. 2.2 lb

Key Features

• INVERTER Technology: Precise, energy-saving heating and cooling

• Heat Performance: Delivers warmth in cold climates, down to -5°F outdoor temperatures

• Compact Design: Slim indoor unit fits tight spaces and complements décor

• Quiet Operation: Indoor sound levels as low as 20 dB(A), outdoor unit at 49 dB(A)

• Washable Filter: Long-lasting, easy-to-clean air filtration

• Smart Controls: Optional wireless LAN module for Wi-Fi control via Kumo Cloud® app

Specifications (Rated Conditions)
Cooling Capacity: 12,000 BTU | EER2: 12.5 | SEER2: 20.0
Heating Capacity @ 47°F: 12,200 BTU | HSPF2: 10 | COP (47°F): 3.61
Heating Capacity @ 17°F: 7,800 BTU
Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 8 A | MOCP: 15 A
Airflow (Dry): 168-468 CFM
Sound Pressure: Indoor 22-47 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‑JX12WL wall-mounted air handler

• Outdoor Unit: MUZ‑JX12WL inverter heat pump condenser

• Hand-Held Remote Controller

Ideal For
Homeowners and contractors seeking a high-efficiency, compact heat pump system for year-round comfort in bedrooms, offices, or smaller living spaces. The MSZ‑JX12WL & MUZ‑JX12WL deliver quiet operation, smart control compatibility, and reliable heating even in colder climates.