The MRCOOL DIY 5th Gen Multi-Zone 18,000 BTU Ductless Heat Pump System makes it easy to enjoy customized comfort in two separate areas of your home. Featuring a high-efficiency 18,000 BTU outdoor condenser paired with one 6,000 BTU air handler and one 12,000 BTU air handler, this system provides reliable heating and cooling for spaces up to approximately 200 sq. ft. and 600 sq. ft.
Designed with homeowners in mind, the DIY installation process eliminates the need for specialized HVAC tools, certifications, or expensive labor costs. The included pre-charged Quick Connect® line sets help simplify installation, making it possible to complete the setup with common hand tools.
Whether you're cooling your home during the summer or keeping warm through the winter, the built-in heat pump technology delivers year-round comfort by efficiently transferring heat rather than generating it. In heating mode, the system extracts heat from the outdoor air and brings it indoors, even during colder weather.
Backed by a 7-Year Compressor Warranty and 5-Year Parts Warranty, this system is built for long-term performance and peace of mind.
Need more flexibility? The MRCOOL DIY 5th Gen Multi-Zone 18,000 BTU condenser can support up to three indoor air handlers. For larger applications, the DIY Multi-Zone 27,000 BTU system can accommodate up to four indoor units.
Key Features
✅ Simple DIY Installation
✅ Pre-Charged Quick Connect® Line Set
✅ Independent Temperature Control for Multiple Rooms
✅ High-Efficiency DC Inverter Technology
✅ Factory-Sealed Refrigeration System
✅ Gold Fin® Corrosion-Resistant Condenser
✅ Environmentally Friendly R-454B Refrigerant
✅ Smart Control Through the MRCOOL Mobile App
✅ Follow Me® Remote Temperature Sensing
✅ Low Ambient Cooling Performance
Enjoy energy-efficient comfort, room-by-room temperature control, and the satisfaction of installing your own heating and cooling system while saving thousands on installation costs.
Specifications
| System Type |
Ductless Mini Split Air Conditioner & Heat Pump |
| Zones |
2 |
| Capacity |
Total: 18,000 BTU
Zone 1: 9,000 BTU
Zone 2: 9,000 BTU |
| Coverage Area |
Total: 700 sq. ft.
Zone 1: 350 sq. ft.
Zone 2: 350 sq. ft. |
| Refrigerant |
R-454B |
| Line Sets Included |
2 x Pre-Charged Line Sets |
| Warranty |
7 Years Compressor
5 Years Parts
Extended Limited Lifetime Replacement
*If the original owner does not register the unit, the warranty defaults to the standard 5 year parts, 7 year compressor warranty **The original, registered owner must be enrolled in the MrCool Care Program every year in order to qualify for the 7 year full unit replacement for compressor failure and lifetime compressor replacement. |
| OUTDOOR UNIT (18K) x 1 |
| Model |
DIY-MULTI3-18HP230D-O |
| Dimensions |
35.04" W x 13.46" D x 26.50" H |
| Cooling Capacity |
18,000 BTU |
| SEER2 |
23.9 |
| EER2 |
13.0 |
| Heating Capacity |
18,000 BTU |
| HSPF2-4 |
10.0 |
| HSPF2-5 |
7.8 |
| Outdoor Noise Level |
60.0 dB(A) |
| Outdoor Operating Temperature |
Cooling: -13°F – 122°F
Heating: -13°F – 75°F |
| Voltage |
208–230V |
| Phase |
1 |
| Cycle |
60Hz |
| Min Circuit Ampacity |
16.0A |
| Max Fuse Breaker |
20.0A |
| Weight |
101.63 lbs |
| INDOOR UNIT (9K) x 2 |
| Model |
DIY-09-HP-WMAH-230D25-O |
| Dimensions |
31.57" W x 7.44" D x 11.69" H |
| Mounting Type |
Wall |
| Cooling Capacity |
9,000 BTU |
| Heating Capacity |
9,000 BTU |
| Coverage Area |
351 to 350 sq. ft. |
| Liquid Line Size |
1/4" |
| Suction Line Size |
3/8" |
| Weight |
24.47 lbs |
Information & Guides
Installation Manual
Brochure
Service Manual
Remote Manual
Accessory Manual
Warranty
AHRI Cert
Energy Guide
