MRCOOL DIY 5th Gen 9k BTU 23.6 SEER Ductless Mini-Split Heat Pump System – Single Zone

Designed with homeowners in mind, the MRCOOL® DIY® 5th Generation 9,000 BTU Ductless Mini-Split makes professional-grade HVAC accessible—no specialized tools or prior experience required. Ideal for rooms up to 350 sq. ft., this high-efficiency 23.6 SEER heat pump system provides both cooling and heating with ease.

Thanks to the 25-foot pre-charged QuickConnect® line set, installation is straightforward and safe. The lines are factory-charged with eco-friendly R-454B refrigerant, eliminating the need for vacuum pumps or refrigerant handling. The included DIYPRO® cable offers a more rugged alternative to traditional conduit, shielding electrical connections from weather, pests, and landscaping equipment.

Control is fully integrated and flexible. Operate the system via the included remote control, the SmartHVAC app on iOS or Android, or use voice commands with Amazon Alexa or Google Assistant. For added longevity in coastal or humid environments, the unit features a Gold Fin™ anti-corrosion coating that protects against salt air and moisture.

Built-in features such as Auto mode, a programmable Timer, and Auto Restart enhance energy efficiency and everyday convenience. In the event of a power outage, the system resumes its previous settings automatically for uninterrupted comfort.

This unit is backed by one of the best warranties in the industry, including a limited lifetime coverage, 7-year compressor warranty, and 5-year parts warranty. Engineered for DIY installation and long-term reliability, the MRCOOL® 5th Gen Mini-Split is a smart investment for year-round climate control.

Key Features

• True DIY Installation – No specialized tools or HVAC experience required. Pre-charged QuickConnect® line set simplifies setup.

• High Efficiency Performance – Rated at 23.6 SEER and 11.5 HSPF, offering year-round comfort with energy savings.

• Smart Control Integration – Control the system via remote, SmartHVAC app (iOS/Android), or voice with Amazon Alexa and Google Assistant.

• Gold Fin™ Corrosion Protection – Extends the life of the condenser, especially in coastal or humid environments.

• Durable DIYPRO® Cable – Replaces traditional conduit, offering weather- and pest-resistant protection.

• Follow Me® Function – The remote senses temperature at your location for personalized comfort.

• Auto Restart – Automatically restores previous settings after power outages.

• Advanced Timer & Auto Modes – Set schedules and let the unit automatically maintain desired room temperatures.

• Backed by Industry-Leading Warranty – Includes a limited lifetime warranty, 7-year compressor warranty, and 5-year parts warranty.

Specifications

• Brand: MRCOOL®

• Series: DIY 5th Generation

• Product Type: Single-Zone Ductless Mini-Split Heat Pump

• Model Number: DIY-09-HP-WM-115D25-O

• UPC: 840255588539

• Voltage: 115V, 1 Phase, 60 Hz

• SEER Rating: 23.6

• EER Rating: 14

• HSPF Rating: 11.5

• Cooling Capacity: 9,000 BTU

• Heating Capacity: 10,000 BTU

• Coverage Area: Up to 350 sq. ft.

• Airflow (CFM): 400

• Compressor Type: Rotary

• Fan Speeds: Variable

• Dehumidification Rate: 0.75 liters/hour

• Refrigerant Type: R-454B (pre-charged)

• Line Set Length: 25 ft.

• Liquid Line Size: 1/4"

• Suction Line Size: 3/8"

• Color: White

• Mount Type: Wall-Mounted

• Control Options: Remote, SmartHVAC App, Amazon Alexa, Google Assistant

• Sound Rating (Indoor): 23–41 dB

• Sound Rating (Outdoor): 54 dB

• Dimensions (Indoor Unit): 30.34” W x 7.44” D x 10.83” H

• Dimensions (Outdoor Unit): 30.34” W x 11.81” D x 21.85” H

• Weight (Indoor/Outdoor): 18 lbs / 54 lbs

• Certifications: Intertek Listed (5031495)

• EnergyGuide & AHRI Certified

• Warranty:

  • Parts: 5 Years

  • Compressor: 7 Years

  • Limited Lifetime Warranty: Yes (registration required)

• Environmentally Friendly: Yes – R-454B low-GWP refrigerant

• Reusable Components: Yes

• Auto Restart: Yes

• Timer Function: Yes

• Indoor Display: Yes

• Indoor Unit Finish: Glossy white

• Warranty Registration Required: Yes

Whats Included?

• (1) 9K BTU Outdoor Condenser

• (1) 9K BTU Indoor Air Handler

• (1) 25 ft. 1/4" x 3/8" Pre-Charged Line Set

• (1) Remote Control

BTU Size Chart

Which BTU rating should I choose?

• The appropriate BTU rating depends on the size of the space you need to heat or cool.
• A higher BTU indicates greater heating and cooling capacity, allowing the air handler to effectively condition larger areas.

*Ceiling height, insulation quality, and local climate can all affect the actual coverage area. For instance, an uninsulated space will need more BTUs to maintain comfort compared to a well-insulated room.