The MRCOOL DIY 5th Generation 48,000 BTU 4-Zone Ductless Mini-Split System is the ultimate heating and cooling solution for homeowners seeking flexible, energy-efficient comfort across multiple rooms—without the need for professional installation. This system includes one 48k BTU multi-zone condenser, two 9k BTU and two 12k BTU wall-mounted air handlers, along with four 25-foot pre-charged Quick Connect line sets, filled with eco-friendly R-454B refrigerant. Designed to cover up to 2,000 sq. ft., it’s perfect for whole-home zoning or multi-room comfort control. With SmartHVAC app compatibility, Amazon Alexa and Google Assistant voice control, and features like Follow Me and Dry Mode, this system offers intuitive climate management at your fingertips. Built with durable Gold Fin corrosion-resistant components and backed by industry-leading warranties, the MRCOOL DIY system delivers powerful, year-round comfort—no vacuuming, charging, or HVAC tech required.

Customize your home’s climate with the MRCOOL DIY 4-Zone 48k BTU Multi-Zone Mini-Split System, built for high-efficiency performance and ultimate convenience.

This 5th Generation setup is ideal for multi-room homes and includes:

• (1) 48k BTU Multi-Zone DIY Condenser (DIY-MULTI6-48HP230D-O)

• (2) 9k BTU Wall-Mounted Air Handlers (2xDIY-09-HP-WMAH-230D25-O)

• (2) 12k BTU Wall-Mounted Air Handlers (2xDIY-12-HP-WMAH-230D25-O)

• (4) 25 ft DIY® Quick Connect Line Sets (4xDIY25-1412-O)

Together, this system efficiently heats and cools up to 2,000 sq. ft., making it ideal for homes needing zoned comfort in four distinct areas.

✅ UL Listed, ETL Listed, and AHRI Certified

🛠️ True DIY Installation

The MRCOOL DIY system is engineered with homeowners in mind. Each pre-charged Quick Connect line set comes pre-filled with eco-friendly R-454B refrigerant, so there's no vacuuming, charging, or special tools required. Just connect the components, tighten the fittings, and you're done—saving time and installation costs.

🌿 Eco-Friendly & Efficient

The 48k BTU condenser delivers an impressive 21.8 SEER2 and HSPF2-4 of 10, giving you powerful performance with reduced energy consumption. This new-generation refrigerant system offers greater environmental safety and efficiency compared to older models.

📱 Smart Home Integration

Control your comfort from anywhere with multiple smart options:

• SmartHVAC app for Apple & Android

• Amazon Alexa & Google Assistant compatibility

• Wireless remote for manual adjustments

• Follow Me feature that tracks the remote’s location for targeted comfort

💧 Built-In Humidity Control

All included air handlers feature Dry Mode, which helps regulate indoor humidity levels and enhances overall indoor air quality for year-round comfort.

🛡️ Built to Last

Designed for durability, the outdoor condenser includes a Gold Fin anti-corrosion coating, perfect for tough climates and coastal areas. The rugged DIYPRO cable also adds weather and wildlife resistance—no need for extra conduit.

🏆 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-MULTI5-48HP230C,2xDIY-09-HP-WMAH-230C25,2xDIY-12-HP-WMAH-230C25,4xDIY25-1412