Mitsubishi HX Series 9,000 BTU Ductless Mini-Split Heat Pump System
The Mitsubishi HX Series 9,000 BTU system pairs the MUZ-HX09NL outdoor heat pump with the MSZ-HX09NL wall-mounted air handler to deliver straightforward, efficient comfort to a single room. Running on low-GWP R454B refrigerant at 20 SEER2, the HX line is Mitsubishi's value-focused ductless option — a dependable choice for bedrooms, offices, and small additions that ships with a wireless remote in the box.
Is 9,000 BTU the Right Size?
Nine thousand BTU is the smallest HX system and is intended for compact, well-defined spaces. As a general guideline it suits rooms of roughly 250 to 450 square feet, and its inverter compressor can modulate down to about 3,600 BTU/h to hold a steady temperature without constant on/off cycling.
Because insulation, ceiling height, sun exposure, and room use all affect the real load, treat square footage as a starting point. A sunny room or one with heat-producing equipment behaves differently from a shaded bedroom of the same size.
Ideal for: bedrooms, home offices, small additions, and converted spaces where value and simple, reliable comfort matter most.
Need more capacity? Step up to the Mitsubishi HX 12,000 BTU mini-split system. Want higher efficiency in the same size? Compare the GX Series 9,000 BTU system at 28.4 SEER2.
Recommended room sizes are general guidelines only. Actual requirements depend on insulation, ceiling height, sun exposure, climate, and room use. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condenser | MUZ-HX09NL — 9,000 BTU Inverter Heat Pump |
|---|---|
| Indoor Air Handler | MSZ-HX09NL Wall-Mounted Evaporator |
| System Type | Single-Zone Ductless Mini-Split Heat Pump |
| Refrigerant | R454B (low-GWP A2L) |
| Cooling Capacity | 9,000 BTU/h (3,600–11,000 range) |
| Heating Capacity (47°F) | 10,900 BTU/h |
| Efficiency | 20 SEER2 / 10.0 HSPF2 / 12.5 EER2 |
| Compressor | Inverter-Driven (KRB073FATMC) |
| Condenser Electrical | 208/230V, 1 Phase, 60 Hz — 10A MCA |
| Included Controller | Wireless Remote (with batteries) |
| Max Line Length / Height | 65 ft / 40 ft |
The MUZ-HX09NL ships with a 1 lb 6 oz factory R454B charge and connects to the MSZ-HX09NL with 1/4" liquid and 3/8" gas flared line sets. Every system includes a handheld wireless remote controller and batteries, so it is ready to operate as soon as it is installed and powered on.
Outdoor & Indoor Unit Features
MUZ-HX09NL Outdoor Condenser
- Inverter-driven compressor modulates for steady comfort
- Low-GWP R454B refrigerant, factory-charged (1 lb 6 oz)
- Linear expansion valve refrigerant control
- Reverse-cycle defrost for winter heating
- Quiet 46 dB(A) cooling sound level
- 208/230V single-phase, 15A max fuse, low 10A MCA
- Corrosion-resistant cabinet finish
- Compact 31-1/2" W × 11-1/4" D × 21-5/8" H, 65 lb
- 1/4" liquid and 3/8" gas flared connections
- Up to 65 ft line length and 40 ft height difference
MSZ-HX09NL Indoor Air Handler
- Wall-mounted low-profile cabinet, only 20 lb
- Included wireless remote controller with batteries
- Quiet operation from 22 dB(A) on the lowest fan speed
- Four-speed fan (Super High to Low)
- Dry mode with up to 1.6 pt/h dehumidification
- Auto horizontal vane airflow control
- Auto-restart after power interruptions
- Weekly timer scheduling
- Emergency operation switch if the remote is unavailable
- Operation indicator lamp
Specifications & Manuals
Product documentation includes indoor and outdoor technical specifications, service references, and installation and operation instructions to assist with selection, installation, and service.
Frequently Asked Questions
Does the HX09 come with a remote control?
Yes. Every MSZ-HX09NL indoor unit ships with a handheld wireless (infrared) remote controller and AAA batteries, plus an emergency operation switch on the unit as a backup.
How large a room will the 9,000 BTU HX system handle?
As a general guideline, roughly 250 to 450 square feet, depending on insulation, ceiling height, and sun exposure.
How does the HX Series differ from the GX Series?
HX is Mitsubishi's value line, rated at 20 SEER2. The GX Series reaches higher efficiency — up to 28.4 SEER2 in the 9,000 BTU size — and adds features like built-in Wi-Fi, at a higher price point.
What refrigerant does the MUZ-HX09NL use?
It uses R454B, a lower-global-warming-potential A2L refrigerant, and arrives with a 1 lb 6 oz factory charge.
What electrical circuit does the 9,000 BTU system need?
It runs on 208/230V single-phase power with a low 10A minimum circuit ampacity and a 15A maximum fuse or breaker.
Does the HX09 provide heat in winter?
Yes. It is a reverse-cycle heat pump rated at 10,900 BTU/h of heating at 47°F with automatic defrost, suited to moderate winter climates.
MUZ HX Technical SpecificationsMUZ HX Service ManualMSZ HX Technical SpecificationsMSZ HX Service ManualMSZ HX 9k to 15k Installation InstructionsMSZ HX 9k to 15k Operation Instructions
