MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 12K + 9K + 6K + 6K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-12K12K12K9K6K6K
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 three 12K, one 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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Whole-Home Climate Control – 55,000 BTU condenser supports up to 6 zones, ensuring personalized comfort in every room.
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DIY Installation – Pre-charged No-Vac line sets make setup simple without requiring special tools or professional help.
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Smart Zone Mix – Includes three 12K, one 9K, and two 6K ceiling cassettes—perfect for a blend of medium, small, and compact spaces.
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Energy-Saving Performance – Inverter technology ensures quiet operation and reduced energy costs year-round.
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Dual Function – Heat pump system provides efficient cooling in summer and reliable heating in winter.
Q&A
Q: What does this package include?
A: A 55,000 BTU DIY ductless mini split condenser paired with six ceiling cassette air handlers: three at 12K BTU, one at 9K BTU, and two at 6K BTU.
Q: What makes it DIY-friendly?
A: It comes with pre-charged R-410A No-Vac Quick Connect lines, eliminating the need for special tools or professional refrigerant handling.
Q: Does it heat as well as cool?
A: Yes, this is a heat pump system, providing efficient cooling in summer and heating in winter.
Q: What type of spaces is this setup ideal for?
A: Designed for mixed room sizes, it covers three medium rooms (12K), one small-to-medium room (9K), and two compact spaces (6K).
Q: Why choose ceiling cassette air handlers?
A: They install flush with the ceiling, save wall space, and deliver 360° airflow for even comfort.
Q: How efficient is it?
A: With inverter technology, the system achieves high SEER efficiency, quiet operation, and reduced energy costs.
Q: Who should choose this system?
A: Perfect for homes or offices with a mix of medium and smaller rooms, where customized zoned comfort and DIY installation are priorities.
Maintenance Tips
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Clean or replace cassette filters every 1–3 months.
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Keep ceiling cassette panels and vents free from dust.
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Inspect outdoor condenser coils and clear away debris.
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Check refrigerant lines, insulation, and connections regularly.
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Schedule annual professional service to maintain reliable multi-zone performance and energy efficiency.
