The MRCOOL DIY 5th Generation 27,000 BTU 2-Zone Mini-Split System is the ideal choice for heating and cooling two separate spaces with different size needs. Featuring a 9K and 18K BTU wall-mounted air handler and a multi-zone condenser, this system offers powerful performance, smart controls, and DIY-friendly installation—perfect for homeowners who want energy-efficient comfort without the cost of professional HVAC services.

This 5th Generation system includes:

• (1) 27k BTU Multi-Zone DIY Condenser (DIY-MULTI4-27HP230D-O)

• (1) 9k BTU Wall-Mounted Air Handler (DIY-09-HP-WMAH-230D25-O)

• (1) 18k BTU Wall-Mounted Air Handler (DIY-18-HP-WMAH-230D25-O)

• (2) 25 ft DIY Quick Connect Line Sets (2xDIY25-1412-O)

Together, this configuration provides reliable heating and cooling for up to 1,250 sq. ft., making it a perfect fit for living rooms and bedrooms, guest suites, home offices, or smaller open-concept areas.

✅ UL Listed, ETL Listed, and AHRI Certified

🛠️ True DIY Installation

The MRCOOL DIY system is built for homeowners—no vacuum pumps or HVAC tools needed. The Quick Connect line sets are pre-charged with R-454B refrigerant, enabling fast and clean setup without needing to handle refrigerants. Simply plug and play for big-time comfort and cost savings.

🌿 Eco-Friendly & Efficient

With an impressive SEER2 rating of up to 22.2 and HSPF2-4 of 10.5, this system not only cuts energy costs but is also designed with R-454B, a more environmentally conscious refrigerant. You get powerful climate control while reducing your home’s carbon footprint.

📱 Smart Home Integration

Control your comfort any way you like:

• SmartHVAC app for iOS & Android

• Voice control with Amazon Alexa & Google Assistant

• Wireless remote included with each air handler

• Follow Me Mode adjusts temperature based on remote location

💧 Built-In Humidity Control

Both 9K and 18K air handlers include Dry Mode, which helps balance indoor humidity, promoting cleaner air and more consistent comfort—especially important in damp or muggy spaces.

🛡️ Built to Last

The outdoor condenser features Gold Fin anti-corrosion protection, built for extreme weather and coastal environments. The system also includes the tough, weather-resistant DIYPRO cable, ensuring long-lasting performance and safety in all seasons.

🏆 Industry-Leading Warranty

• 7-Year Compressor Warranty

• 5-Year Parts Warranty

• Limited Lifetime Warranty with MRCOOL Care Program registration

⭐ This Mini-Split System Replaces the Following Models: DIY-MULTI3-27HP230C,DIY-09-HP-WMAH-230C25,DIY-18-HP-WMAH-230C25,2xDIY25-1412