MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 12K + 12K + 9K + 9K + 6K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-18K12K12K9K9K6K
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, two 12K, two 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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Versatile Zoning – With a mix of 18K, 12K, 9K, and 6K ceiling cassettes, this 55,000 BTU system is ideal for homes with varied room sizes.
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DIY Installation – Pre-charged No-Vac line sets allow simple setup without special tools or professional help.
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Space-Saving Comfort – Ceiling cassette air handlers deliver quiet, even airflow while keeping walls and floors free.
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Efficient Year-Round Use – Inverter-driven heat pump ensures reliable cooling in summer and cost-effective heating in winter.
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Individual Zone Control – Each cassette runs independently, letting homeowners fine-tune comfort and energy use room by room.
Q&A
Q: Can each room have its own temperature setting?
A: Yes — each cassette is independently controlled for personalized comfort in every zone.
Q: Does it work for both heating and cooling?
A: Yes, this is a heat pump system that efficiently handles both summer cooling and winter heating.
Q: Is it really DIY-friendly?
A: Yes. MRCOOL’s No-Vac pre-charged linesets make it one of the few true DIY multi-zone ductless mini split systems on the market.
Q: Why is this setup ideal?
A: This configuration balances one large zone (18K) with multiple smaller zones, making it perfect for homes with a mix of large shared spaces and smaller private rooms.
Maintenance Tips
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Clean or replace air filters in each cassette every 1–2 months for reliable airflow.
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Wipe cassette panels and vents regularly to reduce dust buildup.
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Inspect all condensate drain lines to prevent leaks or clogs.
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Verify pre-charged line set connections remain tight and secure.
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Keep the outdoor condenser clear of dirt, leaves, and obstructions.
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Test remote and smart control functions across all six zones.
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Schedule annual professional maintenance to ensure peak efficiency and long-term system performance.
