MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 12K + 12K + 12K + 12K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-12K12K12K12K12K12K
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 – With 55,000 BTU capacity and 6 ceiling cassette air handlers (12K each), this system efficiently covers multiple rooms or an entire home.
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DIY Installation – Pre-charged No-Vac line sets make setup simple without specialized tools or professional installation.
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Discreet Ceiling Design – OuttaSight cassettes blend seamlessly into ceilings, freeing up wall space while delivering even airflow.
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Energy Efficient – Advanced inverter technology provides reliable heating and cooling with reduced energy use.
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Custom Zoning – Each zone operates independently, giving homeowners personalized comfort control in every room.
Q&A
Q: How much area can this 55K BTU system cover?
A: Up to 3,300 sq. ft., depending on insulation and climate.
Q: Can I install it myself?
A: Yes. The MRCOOL DIY system includes pre-charged No-Vac line sets, allowing true do-it-yourself installation without specialized tools.
Q: What’s included in this 6-zone package?
A: One 55,000 BTU condenser and six 12K BTU one-way ceiling cassette air handlers, plus line sets.
Q: Do all air handlers need to run at once?
A: No — each zone can be controlled independently for maximum comfort and efficiency.
Q: Is this system both heating and cooling?
A: Yes, it’s a heat pump mini split that provides efficient cooling in summer and heating in winter.
Q: Why choose ceiling cassettes instead of wall-mounted units?
A: Ceiling cassettes offer a sleek, low-profile design that saves wall space, blends with the room’s ceiling, and distributes air evenly.
Maintenance Tips
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Clean or replace all air filters in each cassette every 1–2 months.
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Wipe ceiling cassette panels and vents to prevent dust buildup.
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Check each condensate drain line for clogs to avoid water leaks.
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Inspect the pre-charged line sets to confirm secure, leak-free connections.
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Keep the outdoor condenser free from leaves, dirt, and obstructions.
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Test remote and smart control functions for all six zones.
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Schedule annual professional servicing to maintain multi-zone efficiency and extend system life.
