MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 9K + 9K + 9K + 6K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-12K12K9K9K9K6K
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, three 9K and one 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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Custom Comfort Setup – 55,000 BTU condenser paired with 12K, 9K, and 6K cassettes gives balanced heating and cooling for mixed-size rooms.
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DIY-Friendly Installation – Pre-charged No-Vac line sets make setup fast and simple, with no special tools required.
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Discreet Ceiling Style – Cassette air handlers blend into the ceiling for quiet, space-saving operation and even airflow.
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Efficient Performance – Inverter heat pump technology ensures energy savings with reliable year-round comfort.
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Independent Zoning – Each cassette works on its own, letting homeowners control comfort and energy use room by room.
Q&A
Q: Does each room have its own thermostat?
A: Yes. Every cassette is controlled independently, so each room can maintain its own temperature.
Q: Can it heat as well as cool?
A: Yes — this is a heat pump system, offering efficient heating in winter and cooling in summer.
Q: What makes MRCOOL DIY unique?
A: Unlike most multi-zone mini splits, MRCOOL includes No-Vac pre-charged linesets, making this one of the only true DIY 6-zone ductless systems on the market.
Q: Who is this setup best for?
A: Homes that need a balance of medium and smaller zones, such as multiple bedrooms plus common living areas, making it ideal for families with varying comfort needs.
Maintenance Tips
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Clean or replace air filters in each cassette every 1–2 months for optimal airflow.
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Wipe cassette panels and vents to prevent dust buildup.
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Inspect all condensate drain lines regularly to avoid clogs or water leaks.
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Ensure 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 functions for all zones to confirm proper operation.
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Schedule annual professional servicing to maximize system efficiency and lifespan.
