Mitsubishi JX-Series 12K BTU 115V Single-Zone Ductless Mini Split Heat Pump
Efficient single-room comfort with a 115V Mitsubishi ductless system. This JX-Series mini split pairs the MUZ-JX12WL outdoor heat pump with the MSZ-JX12WL wall-mounted indoor unit for dependable heating and cooling without adding ductwork.
With 12,000 BTU of rated cooling, 12,200 BTU of rated heating, and 20.0 SEER2 efficiency, this system is a strong fit for bedrooms, offices, guest rooms, additions, and other small-to-medium spaces where a dedicated comfort zone makes more sense than extending central ductwork.
Not sure if 12K 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 115V wall-mounted system |
| System Models | MUZ-JX12WL outdoor unit + MSZ-JX12WL indoor unit |
| Capacity | 12,000 BTU cooling / 12,200 BTU heating |
| Efficiency | 20.0 SEER2 / 12.5 EER2 / 10.0 HSPF2 |
| Low-Temperature Heating Capacity | 8,600 BTU at 5F |
| Voltage | 115V, 1 phase |
| Refrigerant | R-454B |
| Installation Type | Professional HVAC installation recommended |
Why Choose This Mitsubishi JX System?
- 115V installation option: A strong choice when a 115V single-zone Mitsubishi system is preferred for the project.
- Dedicated room comfort: Heat and cool one room or area without tying that 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 8,600 BTU of rated heating capacity at 5F.
- Quiet wall-mounted design: The 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 extended warranty coverage when eligible equipment is properly registered, subject to warranty terms and installation requirements.
What Is Included?
- 1 Mitsubishi MUZ-JX12WL outdoor heat pump condenser
- 1 Mitsubishi MSZ-JX12WL 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 12K 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 makes this different from the HX-Series?
The JX-Series models in this set are 115V single-zone systems. Choose based on your project's load calculation, electrical plan, and installer recommendation.
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-JX12WL / MSZ-JX12WL system is part of Mitsubishi's R-454B equipment lineup.
Specifications:
| BRAND NAME | Mitsubishi |
| SERIES | JX-Series |
| SYSTEM TYPE | Ductless mini split heat pump |
| OUTDOOR MODEL | MUZ-JX12WL |
| INDOOR MODEL | MSZ-JX12WL |
| ZONE CAPACITY | 1 zone |
| COOLING CAPACITY | 12,000 BTU |
| HEATING CAPACITY | 12,200 BTU |
| HEATING CAPACITY AT 5F | 8,600 BTU |
| AHRI CERTIFICATE NUMBER | 216626293 |
| SEER2 | 20.0 |
| EER2 | 12.5 |
| HSPF2 | 10.0 |
| REFRIGERANT TYPE | R-454B |
| POWER SUPPLY | 115V, 1 phase |
| MAX OVERCURRENT PROTECTION | 29 A |
| LINE SET SIZE | 1/4 in liquid / 3/8 in gas |
| OUTDOOR DIMENSIONS | 31 in W x 22 in H x 11 in D |
| INDOOR DIMENSIONS | 33 in W x 11 in H x 9 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 |
Need help deciding which mini split system is right for you? We are here to help.
Talk with one of our trusted HVAC and Mini Split professionals today!
Call Us!
