Review
The Mitsubishi 42,000 BTU quad zone system represents a practical solution for multi-room comfort without running multiple outdoor condensers. This 9+9+9+9 configuration splits the 42,000 BTU cooling capacity across four independent indoor units, each with its own thermostat. The Hyper Heat branding signals capability in freezing temperatures, where many mini splits struggle. At 3.5 tons total capacity, it fills a specific niche for contractors seeking compact efficiency across diverse room layouts.
Performance metrics tell an important story here. The 21.5 SEER2 rating and 13.4 EER put this unit in the high-efficiency bracket for mini splits, translating to lower operating costs during heating and cooling seasons. The system delivers 32,000 BTU heating output, with Hyper Heat technology maintaining performance in sub-freezing climates where conventional heat pumps lose efficiency. Noise levels range from a barely audible 19 dBA on low to 43 dBA on maximum, suitable for bedrooms and living spaces alike.
Pros & Cons
Pros
- Excellent SEER2 rating of 21.5 delivers 32,000 BTU heating output, crucial for Hyper Heat performance in freezing conditions
- Quad zone 9+9+9+9 setup allows independent control of four separate rooms, eliminating shared thermostats
- 21.5 SEER2 and 13.4 EER ratings rank among top-tier mini split efficiency, reducing operating costs long-term
- Wireless controller included, eliminating additional thermostat expenses and simplifying multi-zone management
- Wall-mounted design with 109-406 CFM range provides flexible placement and whisper-quiet operation down to 19 dBA
Cons
- Requires 40-45 amp breaker and 230V single-phase service, limiting installation options in older homes with undersized panels
- Height spec listed as 1/2 inch with 38 inch depth appears to contain dimensional errors that need manufacturer clarification
- 5-year parts warranty is industry standard but does not cover labor, leaving homeowners exposed to service call costs after year one
Who Should Buy
Best For
Contractors and homeowners upgrading homes with four separate climate zones, particularly in northern climates where Hyper Heat performance matters. Ideal for properties where running four separate outdoor units would be impractical or aesthetically unacceptable.
Consider Alternatives If
Anyone with electrical service under 40 amps or homes unable to accommodate 230V single-phase wiring should explore alternatives with lower amperage requirements.
Installation
Installation requires 230V single-phase service with a 40 to 45 amp breaker, so pre-inspection of electrical infrastructure is critical. The 5/8 inch drain, 3/8 inch liquid line, and 5/8 inch suction line need proper routing and support. Quad zone systems are more complex than single-head units, demanding careful refrigerant charge management and multiple thermostat locations. Professional installation is strongly recommended to ensure proper Hyper Heat calibration and zoning balance.
Warranty & Reliability
Mitsubishi covers parts for five years, a standard duration in the mini split category. This protects against compressor failure, refrigerant leaks, and component defects but excludes labor costs, which can run 500 to 1,500 dollars per service call. Extended warranties through dealers are worth exploring, especially given the multi-zone complexity.
Specifications
| SKU | 201813 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 32,000 |
| Refrigerant | R410A |
| Electrical | 230 V. 1 Phase 60 Hz |
| BTU/Tonnage | 42,000 BTU/3.5 Ton |
| Mini Split Type | Wall Mounted |
| Zone Compatibility | Multi Zone |
| Warranty | 5 Years Parts Warranty |
| Decibel Level (dBA) | 19-43 |
| Weight (in lbs) | 15.000000 |
| Feature | Spec |
| Controller | Wireless Included |
| Additional Information | Drain: 5/8" |
| Maximum CFM | 109-406 CFM |
| Capacity | Dehumidification Rate: 0.23 gal/hr |
| Liquid Line | 3/8" |
| Suction Line | 5/8" |
| Operating Mode | Cooling, Heating |
| Height | 1/2" |
| Width | 1/2" |
| Depth | 38" |
| Resources | Surge Protector Install Guide You will need Adobe® Acrobat® Reader to view PDF documents. |
| Safety Information | PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here. |
| Replaces | MXZ-5C42NAHZ2 |
| Product Features | Hyper Heat |
| SEER2 (Efficiency) | 21.5 |
| EER | 13.4 |
| Max Breaker Size | 45 amps |
| Min. Breaker Size | 40 |
| Amperage Requirement | 50 |
| Length | 15' |
Frequently Asked Questions
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