MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 9K + 9K + 9K + 9K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-12K12K9K9K9K9K
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 two 12K and four 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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Balanced Multi-Room Comfort – 55,000 BTU capacity with a mix of 12K and 9K ceiling cassettes, ideal for medium to small rooms across six zones.
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DIY-Friendly Setup – Pre-charged No-Vac line sets make installation fast and simple without specialized tools.
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Discreet Ceiling Design – OuttaSight cassettes blend into ceilings for quiet, space-saving air distribution.
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Efficient Heating & Cooling – Inverter heat pump technology provides reliable year-round performance with lower energy use.
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Independent Zoning – Each cassette operates separately, giving homeowners precise comfort control and energy savings in every room.
Q&A
Q: What is the total coverage area for this system?
A: It can cover up to 3,300 sq. ft., depending on insulation quality, ceiling height, and local climate.
Q: Does each room have independent temperature control?
A: Yes — each cassette can be controlled individually, allowing for custom comfort settings in every zone.
Q: Can this system heat as well as cool?
A: Yes, it is a heat pump system, meaning it provides both energy-efficient cooling in summer and heating in winter.
Q: Is this a DIY-friendly installation?
A: Absolutely. MRCOOL’s No-Vac pre-charged line sets make it one of the only true DIY ductless mini split systems available.
Q: Why choose this configuration (12K + 12K + 9K + 9K + 9K + 9K)?
A: It’s designed for homes with multiple small to medium rooms, ensuring each area gets the right amount of cooling and heating capacity.
Maintenance Tips
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Clean or replace filters in all six ceiling cassettes every 1–2 months to maintain airflow.
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Wipe cassettes and vents regularly to reduce dust buildup.
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Inspect condensate drain lines in each zone to prevent clogs and leaks.
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Confirm pre-charged line set connections are secure and leak-free.
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Keep the outdoor condenser free of debris, leaves, and obstructions.
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Test remote and smart control functions across all zones for proper operation.
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Schedule annual professional servicing to ensure energy efficiency and extend system lifespan.
