MRCOOL DIY 5th Gen Mini Split - 5-Zone 55,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 18K + 18K + 9K + 9K Ceiling Cassette Air Handlers
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 5-Zone system includes three 18K 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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Balanced Multi-Zone Setup — With 5 zones (18K + 18K + 18K + 9K + 9K) matched to a 55,000 BTU condenser, it offers flexible load distribution across rooms of varying sizes.
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DIY-Friendly Build — Pre-charged lineset and plug-and-play design simplify installation without needing extensive HVAC specialization.
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Modern Efficiency — Part of the 5th Gen line, it uses R-454B refrigerant for improved energy performance and lower environmental impact.
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Discreet & Effective — Ceiling cassette handlers deliver uniform airflow without dominating interior aesthetics.
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Adaptive Load Management — The system smartly balances cooling/heating across zones to match demand and reduce wastage.
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Best For — Homeowners or small commercial spaces seeking a robust, efficient multi-room climate solution with a simpler install process.
Q&A
Q: What is the MRCOOL DIY 5th Gen 5-Zone Mini Split System?
A: A 55,000 BTU ductless air conditioner and heat pump with five ceiling cassette air handlers for customizable whole-home comfort.
Q: What sizes are included?
A: Three 18K BTU and two 9K BTU ceiling cassette air handlers for flexible zoning.
Q: Is professional installation required?
A: No, the DIY system is designed for simple installation without specialized HVAC tools or expertise.
Q: What are the main benefits?
A: Energy-efficient performance, quiet operation, smart controls, and independent temperature control in each zone.
Q: Who is this system ideal for?
A: Homeowners looking for a powerful, customizable, and easy-to-install multi-zone heating and cooling solution.
Maintenance Tips
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Clean or replace air filters every 4–6 weeks for maximum efficiency.
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Wipe ceiling cassettes and indoor units regularly to remove dust buildup.
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Keep the outdoor condenser free from debris and blockages.
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Inspect refrigerant lines and connections annually for leaks.
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Schedule yearly professional maintenance to maintain peak performance.
