Description
The MRCOOL VersaPro MPH421HO13C is a 3.5-ton (42,000 BTU) horizontal heat pump package unit using R-454B refrigerant and rated at 13.4 SEER2, 11.2 EER2 and 6.7 HSPF2. Compressor, coils, blower and controls ship in one factory-charged outdoor cabinet that connects to your ductwork through side supply and return openings, giving year-round heating and cooling without an indoor air handler.
The MRCOOL® VersaPro® Series 42K Package Heat Pump is built to handle demanding, year-round climate control in one compact system. With strong summer cooling and dependable winter heating, it delivers a balance of efficiency, durability, and quiet performance—ideal for homeowners looking to upgrade from an older HVAC setup. Rated at 13.4 SEER2, the VersaPro® 42K helps reduce energy use and monthly utility costs.
It uses R-454B refrigerant, a next-generation, low-GWP option that supports environmentally responsible upgrades while still delivering excellent heating and cooling performance. The power-painted galvanized steel cabinet protects the unit from weather, rust, and long-term wear. Its horizontal discharge design keeps sound levels low—perfect for tight residential spaces or areas where noise is a concern.
Inside the cabinet, aluminum tubing and fin coils improve heat transfer and offer superior corrosion resistance compared to copper, reducing maintenance needs and extending the system’s lifespan. A high-efficiency full series compressor works with a PSC blower motor to maintain consistent airflow, steady temperatures, and dependable operation. Built-in safety protections monitor pressure levels and coil temperatures to keep the system running reliably.
When registered, the unit is backed by a 10-year limited parts warranty and a 10-year compressor warranty. The MRCOOL® VersaPro® 42K is a strong, long-lasting choice for homeowners wanting efficient comfort and dependable performance season after season. Find the Brochure HERE
Key Features
- R-454B refrigerant: Low-GWP A2L refrigerant, 13.4 SEER2 / 11.2 EER2 / 6.7 HSPF2.
- Scroll compressor: Durable single-stage scroll compressor.
- ECM motors: ECM indoor blower and ECM condenser fan motor.
- Horizontal duct connections: Side supply and return for slab or rooftop installs.
- Optional electric heat: 5 kW / 7.5 kW / 10 kW / 15 kW / 20 kW heat kits available for supplemental heat.
Product Specifications
| Brand | MRCOOL |
|---|---|
| Model | MPH421HO13C |
| Series | VersaPro 4th Gen |
| Nominal Capacity | 3.5 Ton (42,000 BTU) |
| Electrical Supply | 208/230V, 1-Phase, 60 Hz |
| SEER2 | 13.4 |
| EER2 | 11.2 |
| HSPF2-4 | 6.7 |
| CFM | 1430 |
| Tonnage | 3.5 |
| Voltage (V) | 230 |
| Max Fuse Breaker (A) | 40 |
| Min Circuit Ampacity (A) | 29.9 |
| Color | Grey |
| Rated Load | 19.9 |
| Full Load | 96 |
| Refrigerant Type | R-454B |
| Decibel Rating (dBA) | 80 |
| Inverter | No |
| Drain Connection Size | 3/4" |
| Control Type | 24V Thermostat |
| Compressor Motor Type | Scroll |
| Condenser Fan Motor Type | ECM |
| Condenser Fan Motor HP | 1/3 |
| Blower Motor Type | PSC |
| Blower Motor HP | 1/4 |
| Blower Motor Speeds | 3 |
| Metering Device | Piston |
| Auxiliary Heater Included | No |
| Auxiliary Heater Available | Yes |
| Auxiliary Heater Sizes | 5 kW / 7.5 kW / 10 kW / 15 kW / 20 kW |
| Net Depth (in) | 58.5 |
| Net Height (in) | 33.06 |
| Net Width (in) | 42.06 |
| Net Weight (lb) | 454 |
Compatibility & Installation
- Electric heat: MRCOOL VersaPro MHK05PB, MHK07PB, MHK10PB and MHK15PB heat kits fit this unit — select one in the "Add an Electric Heat Strip" option above.
- Thermostat: Works with standard 24V thermostats; the MRCOOL MST04 smart thermostat is a matched option.
- Electrical: 208/230V single-phase, 60 Hz. Minimum circuit ampacity 29.9 A, maximum fuse/breaker 40 A.
- Professional installation: Must be installed by a licensed HVAC contractor following MRCOOL instructions and local codes (R-454B is an A2L refrigerant).
