MRCOOL DIY 5th Gen Mini Split - 6-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 9K + 9K + 9K + 9K + 6K Ceiling Cassette Air Handlers - DIY5-6ZC-55HP-18K9K9K9K9K6K
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, four 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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Customizable Multi-Zone Comfort – 55,000 BTU condenser powers up to 6 zones, giving precise heating and cooling where you need it.
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DIY Installation Ready – Pre-charged No-Vac line sets make setup simpler without the need for professional tools.
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Optimized Zone Mix – Includes one 18K, four 9K, and one 6K ceiling cassette—perfect for a combination of large and smaller rooms.
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Efficient & Quiet – Inverter technology reduces energy costs while keeping operation smooth and low-noise.
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Year-Round Use – Heat pump design ensures dependable cooling in summer and efficient heating in winter.
Q&A
Q: What does this system include?
A: A 55,000 BTU DIY ductless mini split condenser paired with six ceiling cassette air handlers: one 18K BTU, four 9K BTU, and one 6K BTU unit.
Q: Is this system DIY-friendly?
A: Yes. It comes with pre-charged R-410A No-Vac Quick Connect lines, allowing homeowners to install without special tools or professional refrigerant work.
Q: Does it both heat and cool?
A: Yes, it’s a heat pump system, providing efficient cooling in summer and heating in winter.
Q: What kind of spaces can it handle?
A: This mix is ideal for one large zone (18K), several medium spaces (9K units), and a smaller room (6K unit)—perfect for varied home or office layouts.
Q: Why choose ceiling cassette air handlers?
A: They sit flush with the ceiling for a clean look and deliver 360° airflow for consistent comfort.
Q: How efficient is it?
A: The inverter-driven technology ensures high SEER efficiency, quiet operation, and reduced energy costs.
Q: Who is this system best for?
A: Homeowners or businesses needing customized comfort across multiple room sizes, without the hassle of ductwork or professional installation.
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 clear of dust.
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Inspect and clean outdoor condenser coils regularly.
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Check refrigerant lines and insulation for damage.
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Schedule annual professional service to maintain efficiency and reliable multi-zone operation.
