MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 12K + 9K + 9K + 6K + 6K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-18K12K9K9K6K6K
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, one 12K, two 9K and two 6K 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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Versatile Multi-Zone Comfort – 55,000 BTU capacity paired with 18K, 12K, 9K, and 6K cassettes delivers customized heating and cooling across six differently sized rooms.
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DIY-Friendly Setup – Pre-charged No-Vac line sets make installation fast and straightforward without special tools.
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Discreet & Efficient – Ceiling cassette air handlers provide quiet, even airflow while maintaining a clean, unobtrusive appearance.
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All-Season Performance – Inverter heat pump technology ensures reliable cooling in summer and cost-effective heating in winter.
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Independent Zone Control – Each cassette operates separately, allowing precise comfort and energy savings in every room.
Q&A
Q: Can I control each room separately?
A: Yes. Every cassette includes independent thermostat control for precise zoning.
Q: Is it suitable for both heating and cooling?
A: Absolutely — this is a heat pump system, ensuring efficient year-round comfort.
Q: What makes this system DIY-friendly?
A: The No-Vac pre-charged line sets make installation simple without the need for specialized tools or professional help.
Q: Who is this best for?
A: Homeowners needing a balanced system with a mix of large, medium, and smaller air handlers, ideal for households with varied room sizes and comfort needs.
Maintenance Tips
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Clean or replace air filters in each cassette every 1–2 months to maintain airflow.
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Wipe cassette grilles and panels regularly to prevent dust buildup.
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Inspect condensate drain lines across all zones to avoid clogs and leaks.
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Verify pre-charged line set connections are secure and leak-free.
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Keep the outdoor condenser clear of leaves, dirt, and obstructions.
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Test remote and smart control features for all zones.
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Schedule annual professional servicing to ensure peak performance and extend system life.
