Product overview
Mitsubishi GX-Series 2-Zone Wall-Mount Mini Split Heat Pump - 9K + 12K
Comfort for two separate rooms from one Mitsubishi multi-zone outdoor condenser. This GX-Series system pairs the MXZ-2D20NL outdoor heat pump with 9K + 12K wall-mounted indoor units for efficient heating and cooling without adding ductwork.
The outdoor system is in Mitsubishi's 20,000 BTU class. For non-ducted indoor combinations like this wall-mount setup, the catalog lists 18,000 BTU cooling, 24,000 BTU heating, 20 SEER2 efficiency, and AHRI certificate 216498925.
This standard heat pump configuration is a strong fit for efficient two-room comfort where extreme low-temperature capacity is not the main design requirement.
At a Glance:
| Best For | two rooms where high-efficiency heating and cooling matter, but Hyper Heat output is not required |
| System Models | MXZ-2D20NL / MSZ-GX09NL / MSZ-GX12NL |
| Indoor Combination | 9K + 12K |
| AHRI Non-Ducted Capacity | 18,000 BTU cooling / 24,000 BTU heating |
| Heating Capacity at 5F | 13,700 BTU |
| Efficiency | 20 SEER2 / 13.0 EER2 / 10.0 HSPF2 |
| Voltage | 208/230V, 1 phase |
| Refrigerant | R-454B |
| Controls | Handheld remote included / WiFi built in on GX wall-mounted indoor units |
| Installation Type | Professional HVAC installation required |
Why Choose This Mitsubishi 2-Zone System?
- Two-room comfort: Heat and cool two spaces independently using one outdoor condenser.
- GX wall-mounted indoor units: GX indoor units include handheld remote control capability and built-in WiFi per the catalog.
- Efficient inverter performance: Mitsubishi inverter technology varies output to help maintain steadier comfort than basic on/off equipment.
- Current-generation refrigerant: Built around Mitsubishi's R-454B equipment lineup.
- Clean installation profile: Wall-mounted indoor units avoid ductwork and are well suited for bedrooms, offices, additions, bonus rooms, and other defined spaces.
What Is Included?
- 1 Mitsubishi MXZ-2D20NL outdoor multi-zone heat pump condenser
- 1 Mitsubishi MSZ-GX09NL 9K wall-mounted indoor unit
- 1 Mitsubishi MSZ-GX12NL 12K wall-mounted indoor unit
- Handheld remote control capability for each indoor unit
Line-set note: choose a line-set length for each indoor unit. Select None for any zone where you do not want a line set included. Mixed-length line sets are supported; electrical accessories, pads, brackets, disconnects, condensate pumps, and other installation materials may need to be quoted or purchased separately.
Before You Order:
- Have your installer confirm room loads, indoor placement, outdoor placement, line-set routing, electrical requirements, and local code requirements.
- Nominal indoor sizes like 9K + 12K are not a substitute for a Manual J load calculation.
- This is not a DIY quick-connect system. Refrigerant piping, evacuation, electrical work, startup, and commissioning should be handled by a qualified HVAC professional.
- The outdoor condenser is a two-port multi-zone unit, so no branch box is required for this configuration.
Frequently Asked Questions:
Why does the title say 20,000 BTU if the indoor combination is 9K + 12K?
The outdoor unit is Mitsubishi's 20,000 BTU class MXZ-2D20 condenser. The catalog's non-ducted AHRI configuration for this condenser lists 18,000 BTU cooling and 24,000 BTU heating.
Can each room have its own temperature setting?
Yes. Each wall-mounted indoor unit can be controlled separately, subject to normal multi-zone operating limits.
Are line sets included?
Only if you select a line-set package variant. The package options are set up as matching pairs for both zones.
Is this a DIY system?
No. Mitsubishi multi-zone equipment should be installed and commissioned by a qualified HVAC professional.
Specifications:
| BRAND NAME | Mitsubishi |
| SERIES | GX-Series |
| SYSTEM TYPE | 2-zone ductless mini split heat pump |
| OUTDOOR MODEL | MXZ-2D20NL |
| INDOOR MODELS | MSZ-GX09NL / MSZ-GX12NL |
| ZONE CAPACITY | 2 zones |
| AHRI CERTIFICATE NUMBER | 216498925 |
| AHRI TYPE | Non-ducted indoor units |
| COOLING CAPACITY | 18,000 BTU |
| HEATING CAPACITY | 24,000 BTU |
| HEATING CAPACITY AT 5F | 13,700 BTU |
| SEER2 | 20 |
| EER2 | 13.0 |
| HSPF2 | 10.0 |
| REFRIGERANT TYPE | R-454B |
| POWER SUPPLY | 208/230V, 1 phase |
| OUTDOOR UNIT TYPE | Standard Heat Pump ported multi-zone condenser |
| 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 |
Indoor Unit Details:
| Indoor Model | Nominal Size | Rated Indoor Capacity | Line Size | Dimensions |
| MSZ-GX09NL | 9K | 9,000 BTU cooling / 10,900 BTU heating | 1/4 in liquid / 3/8 in gas | 11-25/32 in H x 31-13/32 in W x 9-21/32 in D |
| MSZ-GX12NL | 12K | 12,000 BTU cooling / 14,400 BTU heating | 1/4 in liquid / 3/8 in gas | 11-25/32 in H x 31-13/32 in W x 9-21/32 in D |
In-stock systems ship fast and free with curbside freight delivery, typically arriving in 4–10 days. Please inspect each box at delivery and note any damage on the receipt before signing — it keeps any freight claim quick and simple.
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At a glance
Tech specs
| Power | 230 Volt |
|---|---|
| Brand | Mitsubishi |
Sizing in doubt? Our HVAC experts confirm capacity for your rooms before you order — free. Ask us about utility rebates for high-efficiency heat pumps in your area.
