MRCOOL DIY 5th Gen Mini Split - 4-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 12K + 9K Wall Mount Air Handlers - DIY5-4Z-36HP-12K12K12K9K
Take control of your home’s comfort with the MRCOOL 5th Gen DIY Multi-Zone Mini Split System — the ultimate solution for efficient, customizable, and true DIY-friendly heating and cooling.
This powerful 48K BTU 4-Zone system includes one 24K, one 18K, one 9K and one 6K wall mounted air handlers.
Features
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Customize mini-split system: choose the perfect line set length for each zone just above the “Add to Cart” button.
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Ultra-Efficient Cooling & Heating: Enjoy up to 21.8 and 10 HSPF2-4 for energy-efficient year-round comfort.
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DIY-Friendly QuickConnect Installation: No vacuuming or professional tools needed — pre-charged line sets make setup fast and simple.
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Smart Voice & App Control: Full control via SmartHVAC app, Alexa, Google Assistant, or included wireless remote.
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Eco-Conscious Refrigerant: Uses R-454B refrigerant with a low environmental impact.
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Industry-Leading Warranty: Includes 5-year parts, 7-year compressor, and lifetime replacement with MRCOOL Care registration.
What our Experts Think
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All-in-One Climate Control: The MRCOOL DIY 5th Gen 4-Zone Mini Split delivers powerful 36,000 BTU heating and cooling for year-round comfort—perfect for larger homes or multi-room setups.
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True DIY Installation: Designed for homeowners, the pre-charged Quick Connect lines make installation fast and tool-free—no HVAC pro required.
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Zoned Efficiency: Four indoor units (12K + 12K + 12K + 9K BTU) allow independent temperature control in each room, reducing energy waste and maximizing comfort.
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Smart Home Ready: Wi-Fi compatibility with the MRCOOL app, Alexa, and Google Assistant offers seamless remote operation and scheduling.
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Energy-Efficient & Eco-Friendly: High SEER ratings and advanced inverter technology lower utility costs while minimizing environmental impact.
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Reliable All-Season Use: Heat pump function ensures efficient performance even in extreme temperatures, backed by MRCOOL’s trusted warranty and support.
Q&A
Q: What is the MRCOOL DIY 5th Gen 4-Zone Mini Split?
A: It’s a 36,000 BTU ductless heat pump and air conditioner system that efficiently heats and cools up to four zones with included 12K + 12K + 12K + 9K wall-mounted air handlers.
Q: Is professional installation required?
A: No. The MRCOOL DIY system features pre-charged Quick Connect lines, allowing homeowners to install it without special tools or HVAC experience.
Q: How energy efficient is this unit?
A: With high SEER2 ratings and inverter technology, it delivers powerful, quiet performance while reducing energy costs.
Q: Can it both heat and cool?
A: Yes. The heat pump provides reliable cooling in summer and efficient heating in winter for year-round comfort.
Q: What smart features are included?
A: Built-in Wi-Fi lets you control temperature, zones, and schedules from the MRCOOL app, Alexa, or Google Assistant.
Q: What’s included in the package?
A: One 36K BTU outdoor condenser, four wall air handlers (12K × 3, 9K × 1), pre-charged line sets, communication cables, and installation accessories.
Q: Is it suitable for multi-room homes or offices?
A: Yes. It’s ideal for homes, workshops, and offices needing custom temperature control across multiple rooms.
Maintenance Tips
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Clean Filters Monthly: Remove and wash air filters to maintain strong airflow and energy efficiency.
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Inspect Outdoor Condenser: Keep the condenser free of leaves, dirt, and debris to ensure proper heat exchange.
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Check Drain Lines: Clear condensate drain lines to prevent leaks or mold growth.
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Tighten Connections: Verify refrigerant and electrical connections are secure for optimal performance.
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Seasonal Checkup: Before summer and winter, inspect for unusual noises, ice buildup, or airflow changes.
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