Description
The MRCOOL Universal Series MDPH18036D is a 3-ton DC inverter heat pump package unit running low-GWP R-32 refrigerant. It reaches up to 18 SEER2 and 8.5 HSPF2, modulates its inverter compressor to match the load, and keeps heating down to -22°F outdoor temperature — a self-contained, all-electric system for homes that want cold-climate heat pump performance without a split system.
The MRCOOL® 2nd Generation Universal® Series 36K Inverter Packaged Heat Pump is designed to deliver dependable heating and cooling while lowering energy costs and environmental impact. Built with advanced DC inverter technology, the compressor runs at variable speeds to match your home’s exact needs, maintaining steady comfort without the frequent system cycling seen in older systems.
This reduces wear on components, improves efficiency, and helps the unit operate at a whisper-quiet frequency. With an impressive 18 SEER2 rating, this packaged system significantly reduces energy consumption while still providing strong airflow and performance. It is engineered to handle extreme climates, delivering reliable heating in temperatures as low as –22°F (–30°C) and cooling in conditions as high as 125°F (52°C).
No matter the season, homeowners can count on consistent comfort and efficiency. Environmentally conscious design is another advantage. The Universal® 36K uses R-32 refrigerant, a modern, lower-GWP alternative that reduces environmental impact compared to traditional refrigerants. This makes it a sustainable and forward-thinking choice for today’s homeowners.
Installation is simplified with a versatile multi-position design that supports vertical upflow/downflow and horizontal configurations. Built for durability, the MRCOOL® Universal® Series 36K is backed by a 10-year parts and labor warranty, giving homeowners confidence in long-term performance. It’s a smart investment in comfort, savings, and sustainability. Find the Brochure HERE
Key Features
- DC inverter compressor: Variable-speed rotary compressor and EEV metering match output to the load.
- Cold-climate heating: Rated heating operation down to -22°F.
- R-32 refrigerant: Low-GWP, high-efficiency refrigerant.
- Quiet operation: 63 dBA outdoor sound rating.
- Optional electric heat: 6kW, 9kW, 12kW heat kits available.
- 10-year parts & labor warranty: MRCOOL base warranty covers parts and labor for 10 years.
Product Specifications
| Brand | MRCOOL |
|---|---|
| Model | MDPH18036D |
| Series | Universal Series |
| Nominal Capacity | 3 Ton (34,000 BTU) |
| Electrical Supply | 208/230V, 1-Phase, 60 Hz |
| SEER2 | 18 |
| EER2 | 11.2 |
| HSPF2 | 8.5 |
| Tonnage | 3 |
| Cooling Capacity (BTU) | 34,000 |
| Heating Capacity (BTU) | 34,000 |
| Voltage (V) | 208/230 |
| Phase | 1 |
| Cycle | 60 |
| Max Fuse Breaker (A) | 40 |
| Min Circuit Ampacity (A) | 35 |
| Color | Grey |
| Refrigerant Type | R-32 |
| Refrigerant Volume (oz) | 149.9 |
| Decibel Rating (dBA) | 63 |
| Inverter | Yes |
| Min Ambient Cool (°F) | 23 |
| Min Ambient Heat (°F) | -22 |
| Drain Connection Size | 3/4 |
| Compressor Motor Type | Inverter Rotary |
| Condenser Fan Motor Type | Direct Drive |
| Condenser Fan Motor RPM | 720 |
| Blower Motor Type | Direct Drive |
| Blower Motor Speeds | 10 |
| Blower Motor RPM | 920 |
| Metering Device | EEV |
| Auxiliary Heater Included | No |
| Auxiliary Heater Available | Yes |
| Auxiliary Heater Sizes | 6kW, 9kW, 12kW |
| AHRI Certified | yes |
| Net Depth (in) | 35.44 |
| Net Height (in) | 49.25 |
| Net Width (in) | 44 |
| Net Weight (lb) | 523 |
Compatibility & Installation
- Electric heat: MRCOOL MDPHK06D (6 kW), MDPHK09D (9 kW) and MDPHK12D (12 kW) 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 35 A, maximum fuse/breaker 40 A.
- Professional installation: Must be installed by a licensed HVAC contractor following MRCOOL instructions and local codes.
