Overview
MRCOOL DIY Select 12000 BTU 17.5 SEER2 Ductless Mini Split System - R454B - 115V
Professional heating and cooling without the expense of professional installation. The MRCOOL DIY Select 12000 BTU Single-Zone Mini-Split Heat Pump delivers dependable year-round comfort for bedrooms, home offices, living areas, studios, and other spaces up to 550 sq. ft.
With efficient inverter performance, ultra-quiet operation, smart controls, and an included pre-charged Quick Connect® line set, this system is designed for straightforward homeowner installation. Mount the units, connect the line set, provide power, and enjoy convenient app-controlled comfort without vacuum pumps, refrigerant gauges, or hiring an HVAC contractor.
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System Capacity: Delivers 12,000 BTU of heating and cooling for spaces up to 550 sq. ft. Efficiency ratings of 17.5 SEER2 and 9.0 HSPF2-4 help provide dependable year-round comfort while keeping energy use under control.
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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 continuously adjusts output based on the room’s actual demand, helping reduce energy consumption and maintain more consistent temperatures without frequent on-and-off cycling.
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Ultra-Quiet Performance: Indoor sound levels reach as low as 17.5 dB(A) in Sleep mode, making this system a strong choice for bedrooms, offices, nurseries, and other spaces where quiet operation matters.
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Smart Control via MRCOOL® Comfort App: Adjust temperatures, switch operating modes, create schedules, and manage the system remotely through the MRCOOL® Comfort App. Voice control is also supported 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 requirements.
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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 |
12,000 BTU |
| Heating Capacity |
12,000 BTU |
| Coverage Area |
Up to 550 sq. ft. |
| SEER2 |
17.5 |
| EER2 |
8.5 |
| HSPF2-4 |
9.0 |
| HSPF2-5 |
6.8 |
| Outdoor Noise Level |
54 dB(A) |
| Indoor Noise Level |
17.5–44.5 dB(A) |
Dimensions & Weight
| Air Handler Dimensions |
31.57" W × 7.87" D × 11.61" H |
| Air Handler Weight |
24.91 lbs |
| Condenser Dimensions |
28.35" W × 10.63" D × 19.49" H |
| Condenser Weight |
54.89 lbs |
Electrical Requirements
| Voltage |
115V |
| Phase |
Single Phase |
| Frequency |
60 Hz |
| Minimum Circuit Ampacity |
19.5A |
| Maximum Fuse/Breaker |
20A |
Refrigerant & Piping
| Refrigerant Type |
R-454B |
| Refrigerant Charge |
21.52 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
| 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 12000 BTU System
12,000 BTU Indoor Air Handler
12,000 BTU Outdoor Condenser
11.5 ft Quick Connect® line set
13-foot DIYPRO® cable
WiFi Smart Controller (built-in)
Remote
User Manual & Warranty Documentation
