Overview
MRCOOL DIY Select 9000 BTU 17.5 SEER2 Ductless Mini Split System - R454B - 115V
Professional comfort without the cost of professional installation. The MRCOOL DIY Select 9000 BTU Single-Zone Mini-Split Heat Pump provides efficient year-round heating and cooling for bedrooms, offices, studios, guest rooms, and other spaces up to 400 sq. ft.
With inverter-driven performance, quiet operation, smart controls, and an included pre-charged Quick Connect® line set, homeowners can complete the installation without vacuum pumps, refrigerant gauges, or hiring an HVAC contractor. Mount the units, connect the line set, supply power, and enjoy dependable comfort from your phone or remote.
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System Capacity: Provides 9,000 BTU of heating and cooling for spaces up to 400 sq. ft. With ratings of 17.5 SEER2 and 8.8 HSPF2-4, it delivers efficient year-round performance while helping manage operating costs.
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DIY Quick Connect® Line Set (11.5 ft.): Includes an 11.5 ft. factory pre-charged line set with R-454B refrigerant and sealed Quick Connect® fittings. No vacuum pump, manifold gauges, or refrigerant handling is required. Optional 16 ft., 25 ft., 35 ft., and 50 ft. line-set lengths are available separately.
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Inverter Technology: The variable-speed compressor automatically adjusts output to match the room’s current demand, helping maintain consistent temperatures while avoiding the energy-wasting on-and-off cycling of conventional systems.
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Ultra-Quiet Performance: Indoor sound levels reach as low as 18 dB(A) in Sleep mode, making this system an excellent choice for bedrooms, home offices, nurseries, and other quiet spaces.
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Smart Control via MRCOOL® Comfort App: Adjust the temperature, change operating modes, create schedules, and control the system remotely through the MRCOOL® Comfort App. Voice control is also available through Amazon Alexa and Google Assistant.
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Future-Ready Refrigerant: Uses R-454B, a next-generation refrigerant with a lower global-warming potential than older refrigerants, helping reduce environmental impact while meeting updated industry standards.
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Warranty and Care Program Coverage: Backed by a 2-year compressor warranty and a 1-year parts warranty.
Specifications
Capacity & Performance
| Zone Capacity |
1 Zone |
| Cooling Capacity |
9,000 BTU |
| Heating Capacity |
9,000 BTU |
| Coverage Area |
Up to 400 sq. ft. |
| SEER2 |
17.5 |
| EER2 |
9.8 |
| HSPF2-4 |
8.8 |
| HSPF2-5 |
6.8 |
| Outdoor Operating Temperature (Cooling) |
-13°F to 122°F |
| Outdoor Operating Temperature (Heating) |
-13°F to 75°F |
| Outdoor Noise Level |
54 dB(A) |
| Indoor Noise Level |
18–43 dB(A) |
Dimensions & Weight
| Air Handler Dimensions |
28.7" W × 7.87" D × 11.5" H |
| Air Handler Weight |
23.81 lbs |
| Condenser Dimensions |
28.35" W × 10.63" D × 19.49" H |
| Condenser Weight |
54.67 lbs |
Electrical Requirements
| Voltage |
115V |
| Phase |
Single Phase |
| Frequency |
60 Hz |
| Minimum Circuit Ampacity |
17A |
| Maximum Fuse/Breaker |
20A |
Refrigerant & Piping
| Refrigerant Type |
R-454B |
| Refrigerant Charge |
17.28 oz |
| Included Line Set Length |
11.5 ft. |
| Maximum Line Set Length |
75 ft. |
| Liquid Line Size |
1/4" |
| Suction Line Size |
3/8" |
Features
| Inverter Technology |
Yes |
| DC Blower Motor |
Yes |
| DC Condenser Fan Motor |
Yes |
| Reusable Air Filter |
Yes |
| Adjustable Thermostat |
Yes |
| Fan Only Mode |
Yes |
| Auto Mode |
Yes |
| Sleep Mode |
Yes |
| Wi-Fi Enabled |
Yes |
| Mobile App Control |
Yes |
| iOS Compatible |
Yes |
| Android Compatible |
Yes |
| Remote Control Included |
Yes |
Certifications
| Certification |
Status |
| AHRI Certified |
Yes |
| UL Listed |
Yes |
| CSA Listed |
Yes |
| ETL Listed |
Yes |
| ENERGY STAR® Certified |
No |
Warranty
| Compressor Warranty |
2 Years |
| Parts Warranty |
1 Year |
Installation & Guides
BROCHURE
INSTALL MANUAL
REMOTE MANUAL
SERVICE MANUAL
WARRANTY DOC
AHRI CERTS
ENERGY GUIDE CERTS
Whats Included in the Box
MRCOOL DIY Select 9000 BTU System
9,000 BTU Indoor Air Handler
9,000 BTU Outdoor Condenser
11.5 ft Quick Connect® line set
13-foot DIYPRO® cable
WiFi Smart Controller (built-in)
Remote
User Manual & Warranty Documentation
