Mitsubishi 18,000 BTU HX-Series 20 SEER2 Single Zone Wall Mount Mini Split Heat Pump System - R454B | 230V

Mitsubishi HX-Series 18K BTU Single-Zone Ductless Mini Split Heat Pump

Efficient, quiet comfort for one dedicated space. This Mitsubishi HX-Series ductless mini split pairs the MUZ-HX18NL outdoor heat pump with the MSZ-HX18NL wall-mounted indoor unit for dependable heating and cooling without adding ductwork.

With 17,200 BTU of rated cooling, 18,000 BTU of rated heating, and 20.0 SEER2 efficiency, this system is a strong fit for larger bedrooms, living areas, finished basements, additions, and open rooms where comfort needs to be controlled separately from the rest of the home.

Not sure if 18K is the right size? Confirm your room load, insulation, sun exposure, and installation plan before ordering so the system is matched correctly to the space.

Currently only available in GA, TN, OH, IN, and KY

At a Glance:

Best For	One-zone heating and cooling with a quiet wall-mounted indoor unit
System Models	MUZ-HX18NL outdoor unit + MSZ-HX18NL indoor unit
Capacity	17,200 BTU cooling / 18,000 BTU heating
Efficiency	20.0 SEER2 / 12.55 EER2 / 9.5 HSPF2
Low-Temperature Heating Capacity	12,600 BTU at 5F
Voltage	208/230V, 1 phase
Refrigerant	R-454B
Installation Type	Professional HVAC installation recommended

Why Choose This Mitsubishi 18K System?

• Dedicated zone comfort: Heat and cool one room or open area without tying the space to a central duct system.
• Efficient inverter performance: Mitsubishi inverter technology adjusts output as conditions change, helping maintain steadier comfort than basic on/off systems.
• Year-round heat pump operation: Provides both air conditioning and heating from the same system, with 12,600 BTU of rated heating capacity at 5F.
• Quiet wall-mounted design: The compact indoor unit mounts high on the wall to distribute air through the room while keeping floor space open.
• Modern R-454B refrigerant: Built for Mitsubishi's current R-454B equipment generation.
• Warranty confidence: Mitsubishi lists a 10-year parts and compressor limited warranty when eligible equipment is registered within 90 days, subject to warranty terms.

What Is Included?

• 1 Mitsubishi MUZ-HX18NL outdoor heat pump condenser
• 1 Mitsubishi MSZ-HX18NL wall-mounted indoor air handler
• Wireless remote control capability for the indoor unit

Before You Order:

• Have your installer confirm the room load and that a 18K system is appropriate for the space.
• Confirm line-set length, indoor and outdoor placement, condensate routing, electrical requirements, and local code requirements before purchase.
• This is not a DIY quick-connect system. Refrigerant piping, evacuation, electrical work, startup, and commissioning should be handled by a qualified HVAC professional.
• Line sets, wall brackets, disconnects, pads, electrical materials, and installation accessories may be sold separately unless specifically included.

Frequently Asked Questions:

What size room is this best for?
A 18K mini split is commonly used for larger bedrooms, living areas, finished basements, additions, and open rooms, but the right size depends on room load, insulation, ceiling height, windows, sun exposure, and climate. A qualified installer should confirm sizing.

Does this system heat and cool?
Yes. This is a heat pump system designed for both air conditioning and heating.

Is this a DIY system?
No. This Mitsubishi system should be installed by a qualified HVAC professional.

Does it use R-454B refrigerant?
Yes. The MUZ-HX18NL / MSZ-HX18NL system is part of Mitsubishi's R-454B equipment lineup.

Specifications:

BRAND NAME	Mitsubishi
SERIES	HX-Series
SYSTEM TYPE	Ductless mini split heat pump
OUTDOOR MODEL	MUZ-HX18NL
INDOOR MODEL	MSZ-HX18NL
ZONE CAPACITY	1 zone
COOLING CAPACITY	17,200 BTU
HEATING CAPACITY	18,000 BTU
HEATING CAPACITY AT 5F	12,600 BTU
AHRI CERTIFICATE NUMBER	215862742
SEER2	20.0
EER2	12.55
HSPF2	9.5
REFRIGERANT TYPE	R-454B
POWER SUPPLY	208/230V, 1 phase
MAX OVERCURRENT PROTECTION	29 A
LINE SET SIZE	1/4 in liquid / 1/2 in gas
OUTDOOR DIMENSIONS	31 in W x 28 in H x 11 in D
INDOOR DIMENSIONS	36 in W x 12 in H x 11 in D
REGISTERED WARRANTY	10-year parts and compressor limited warranty when registered within 90 days; terms apply
NON-REGISTERED WARRANTY	5-year parts / 7-year compressor limited warranty; terms apply