Mitsubishi MSZ-EX12NLB 12,000 BTU Wall Mounted Indoor Unit - R454B

Mitsubishi MSZ‑EX12NLB: 12,000 BTU Wall‑Mounted Mini‑Split Indoor Unit

The MSZ‑EX12NLB indoor unit delivers efficient 12,000 BTU heating and cooling (14,000 BTU heating nominal). Powered by R‑454B refrigerant and DC inverter technology, it ensures quiet, energy‑wise comfort with advanced filtration and corrosion‑resistant features. 

Note: This system is not compatible with Mitsubishi’s smart outdoor units such as the SUZ-M, PUZ, or MXZ series.

General Information
System Type: Wall‑mounted ductless indoor air handler (requires standalone condenser)
Model: MSZ‑EX12NLB
Capacities: 12,000 BTU Cooling | 14,000 BTU Heating (nominal)
Room Size: Ideal for ~500 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R‑454B (pre‑charged)

Key Features

• INVERTER/DC Fan Motor: DC inverter and fan motor for precise, quiet, energy‑efficient operation
• Dual Barrier Coating: Reduces dust, smoke, and oil buildup on heat exchanger
• Advanced Filtration: Hybrid catechin nano‑platinum filter captures and neutralizes allergens
• Econo Cool Mode: Enhances cooling efficiency by adjusting airflow and set‑point
• Smart Set & Wi‑Fi Ready: Save preferred settings and control via Comfort app, remote, or wired controller
• Sleek Design & Color Options: Slim profile (7.7 in. depth) available in black (MSZ‑EX12NLB), silver (MSZ‑EX12NLS), or white (MSZ‑EX12NLW)

Specifications (Rated Conditions)

• Cooling Capacity: 12,000 BTU/h
• Heating Capacity: 14,000 BTU/h nominal
• Airflow (Cooling Dry): 143–391 CFM; (Heating Dry): 143–479 CFM
• Sound (Cooling): 21–42 dB(A); (Heating): 21–46 dB(A)
• Power: 208/230 V, 1‑Phase, 60 Hz; MCA: 1 A; MOCP: 15 A
• Dimensions (W×D×H): 34‑13/16″ × 7‑11/16″ × 11‑3/4″; Weight: 26 lb
• Piping: Liquid ¼″ | Gas ⅜″ | Drain: ⅝″ O.D. 

Included Components

• Indoor Unit: MSZ‑EX12NLB wall‑mounted air handler
• Wireless Remote Controller
• Standard Installation Accessories (bracket, lineset, filters)

Ideal For
Homeowners or contractors adding a stylish, quiet, efficient 12 k BTU indoor zone to a ductless system. With advanced allergen filtration, Econo Cool, and smart control, the MSZ‑EX12NLB upgrades comfort with convenience.