MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 12K + 12K + 12K + 9K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-12K12K12K12K12K9K
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 55K 6-Zone system includes one 18K, three 12K and two 9K ceiling cassette 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 22 SEER2 and 10.6 HSPF2-4 for energy-efficient year-round comfort.
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Low-Profile Ceiling Cassette Design: Flush-mounted unit fits between standard ceiling joists for a clean, built-in look.
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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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Whole-Home Comfort – 55,000 BTU system supports up to 6 zones, each with its own ceiling cassette for targeted heating and cooling.
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DIY-Friendly Installation – Pre-charged No-Vac line sets make setup easier without the need for special tools.
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Energy Efficient – Advanced inverter technology ensures quiet operation, reduced energy costs, and consistent performance.
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Flexible Zoning – Includes five 12K BTU cassettes and one 9K BTU cassette, perfect for customizing comfort across different room sizes.
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Year-Round Use – Heat pump design delivers efficient heating in winter and cooling in summer.
Q&A
Q: What is this system?
A: A 6-zone DIY-friendly ductless mini split system with a 55,000 BTU condenser paired with six ceiling cassette air handlers (five at 12K BTU each and one at 9K BTU).
Q: What makes it DIY-friendly?
A: The system comes with pre-charged R-410A No-Vac Quick Connect lines, eliminating the need for vacuum pumps or professional refrigerant handling.
Q: What size spaces can it handle?
A: With six ceiling cassette units, it can cool and heat up to 6 separate rooms or open spaces, making it ideal for large homes, offices, or commercial applications.
Q: Does it provide both cooling and heating?
A: Yes, it functions as a ductless heat pump system, delivering efficient year-round comfort.
Q: What’s special about the ceiling cassette air handlers?
A: They install flush with the ceiling, saving wall space while providing 360° airflow for even comfort distribution.
Q: Is it energy efficient?
A: Yes, it uses inverter technology and is designed for high SEER efficiency ratings, lowering energy costs compared to traditional systems.
Q: Who is this system best for?
A: Perfect for large multi-room homes, apartments, or offices where ductwork is not practical but zoned comfort is essential.
Maintenance Tips
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Clean or replace cassette air filters every 1–3 months.
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Wipe cassette panels and keep vents dust-free.
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Inspect outdoor condenser coils and clear debris.
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Check refrigerant lines and connections for wear.
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Schedule annual professional service to maintain multi-zone efficiency and reliability
