MRCOOL DIY® 5th Gen Multi Zone Condenser

MRCOOL® 5th Generation DIY® Multi-Zone Mini-Split Condenser Series

The MRCOOL® 5th Generation DIY® Multi-Zone Mini-Split Condenser series offers powerful, flexible, and energy-efficient home climate control—without the need for professional installation. Designed for homeowners looking to save time and money, these systems feature true DIY compatibility with no special tools or HVAC expertise required.

Available in sizes ranging from 18k to 55k BTUs, these systems can support 2 to 6 air handlers and heat or cool a combined area of 750 to 2,290 sq. ft., depending on the model. Ideal for everything from apartments to full-size homes, each system utilizes patented pre-charged Quick Connect® line sets, filled with eco-friendly R-454B refrigerant—offering an upgrade in both efficiency and sustainability over previous refrigerants. These line sets (sold separately) eliminate the need for vacuuming and charging, dramatically simplifying installation.

Each model boasts impressive efficiency ratings, with SEER2 values up to 23.9 and HSPF2-4 ratings as high as 10.6, helping you reduce long-term energy costs while enjoying optimal year-round comfort.

Smart control features come standard across the line:

• Seamless integration with the SmartHVAC app (iOS and Android)

• Voice control compatibility with Amazon Alexa and Google Home

• The ability to set zone-specific schedules, modes, and temperature settings

• Real-time energy usage monitoring

With these advanced tools, you can customize your comfort with ease—from anywhere.

The MRCOOL® 5th Gen DIY® Multi-Zone Series is backed by one of the best warranties in the industry:

• 7-year compressor warranty

• 5-year parts warranty

• Limited Lifetime Replacement Warranty when enrolled in the MRCOOL® Care Program

Whether you’re retrofitting a single floor or outfitting an entire house, MRCOOL® DIY® Multi-Zone systems offer the perfect blend of power, convenience, efficiency, and peace of mind—all in a package you can install yourself.

Compatible Air Handler Combinations (Max 39,000 BTU)

Connect 6K, 9K, 12K, 18K, or even 24K air handlers (not exceeding 39,000 BTU total). A minimum of 2 air handlers must be connected. Ideal total indoor load falls between 25,200 – 36,000 BTU (70%–100% of capacity), but you may connect up to 39K BTU total (108% diversity load).

Example combinations include:

• 18K + 12K + 9K = 39K
• 12K + 12K + 12K = 36K
• 9K + 9K + 9K + 9K = 36K
• 24K + 12K = 36K (3 ports unused)
• 18K + 9K + 6K + 6K = 39K

Recommended Wire Size

• Recommended: 10 AWG copper wire – supports 25A MCA and 30A max fuse
• One Size Smaller (12 AWG): Not advised – may exceed ampacity under load and fail local code
• One Size Larger (8 AWG): Beneficial for long wire runs, improving voltage stability and safety

Note: Total indoor unit BTU capacity must be calculated before installation. MRCOOL 5th Gen condensers are pre-charged with R-454B and are not compatible with previous R-410A systems. Always follow installation guidelines.

Shop with confidence at MRCOOL Direct – your #1 Most trusted MRCOOL Authorized Dealer. 

SPECIFICATIONS & DIMENSIONS