Review
The Mitsubishi Quad Zone H2i system represents a premium entry point in mini-split technology, designed for homeowners seeking efficient multi-zone climate control without traditional ductwork. At 42,000 BTU cooling and 32,000 BTU heating capacity, this unit targets moderate-sized homes and specific zone applications rather than whole-house solutions. The quad-zone configuration allows four independent zones, making it flexible for complex layouts, renovations, or homes where central systems fell short.
Performance metrics tell a compelling story for efficiency-conscious buyers. The 21.5 SEER2 rating positions this among top-tier inverter-driven heat pumps, meaning lower electricity consumption and reduced operating costs. The 32,000 BTU heating output addresses a real pain point for cold-climate users where typical heat pumps struggle below 30 degrees. EER of 13.4 indicates strong part-load efficiency during spring and fall, when most systems run intermittently. Dehumidification at 0.38 gallons per hour provides meaningful moisture control in humid basements or bonus rooms.
Pros & Cons
Pros
- 21.5 SEER2 rating delivers excellent cooling efficiency and lower operating costs year-round
- 32,000 BTU heating output handles cold-climate demands better than many competitors in this class
- Quad-zone configuration (6+9+9+12 tons) allows independent temperature control in up to four rooms simultaneously
- 19-45 dB noise range means whisper-quiet operation at low speeds, minimal disruption in bedrooms
- Wireless controller included, eliminating retrofit wiring costs and simplifying installation
- 13.4 EER rating demonstrates strong part-load efficiency during moderate weather days
Cons
- 42,000 BTU cooling capacity limits this to smaller homes or specific zone applications, not whole-house cooling in larger residences
- Amperage requirement of 50A with 40-45A breaker sizing demands qualified electrician installation and potentially upgraded service panels
- 5-year parts warranty is standard industry coverage but leaves no buffer beyond typical compressor failure windows
Who Should Buy
Best For
Homeowners in cold climates needing efficient zone heating and cooling in 800-1,200 square foot spaces, particularly those with finished basements, master suites, or home offices requiring independent temperature control. Contractors seeking reliable Mitsubishi equipment for retrofit applications where ductwork installation is impractical.
Consider Alternatives If
Anyone living in consistently hot climates prioritizing heavy cooling loads should look elsewhere, as 42,000 BTU cooling is undersized for full-home AC in most warm regions.
Installation
Installation requires qualified HVAC technicians due to electrical demands, 50A amperage requirement, and proper refrigerant charging protocols. The wireless controller simplifies control wiring, reducing labor hours compared to hardwired alternatives. Single-phase 230V requirement matches most residential electrical panels. Line set connections use standard 3/8-inch liquid and 5/8-inch suction lines with included 15-foot lengths, adequate for typical residential installations within that distance.
Warranty & Reliability
The 5-year parts warranty covers compressors, coils, and internal components but does not extend to labor or seasonal maintenance items. This aligns with industry standards and provides reasonable protection against manufacturing defects during the critical early ownership period. Extended warranties are typically available through dealers at additional cost for extended peace of mind.
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) | 19-45 |
| Weight (in lbs) | 15.000000 |
| Feature | Spec |
| Controller | Wireless Included |
| Additional Information | Drain: 5/8" |
| Maximum CFM | 109-399 CFM |
| Capacity | Dehumidification Rate: 0.38 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. |
| Phase | Single Phase |
| 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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