MRCOOL DIY 5th Gen Mini Split - 6-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 9K + 9K + 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 48K 6-Zone system includes two 12K and four 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 21.8 SEER2 and 10 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 Coverage – Two 12K cassettes are well-suited for medium rooms like living rooms, master bedrooms, or family spaces. Four 9K units provide efficient comfort in smaller bedrooms, offices, or dens.
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Right-Sized for Balanced Homes – At 48K BTU, this condenser is slightly lower capacity than the 55K model, making it ideal for homes that don’t need maximum output but still require full multi-room control.
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DIY-Friendly Install – Comes with MRCOOL’s patented pre-charged No-Vac line sets, meaning no need for special tools, gauges, or professional vacuuming.
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Year-Round Comfort – Heat pump technology with inverter-driven efficiency ensures both cooling in summer and heating in winter while keeping utility costs lower.
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Discreet Design – Ceiling cassette air handlers blend seamlessly into ceilings and distribute air widely and evenly across each room.
Q&A
Q: What comes with this system?
A: A 48,000 BTU DIY heat pump condenser paired with six ceiling cassette air handlers: two at 12K BTU and four at 9K BTU.
Q: Is it DIY install friendly?
A: Yes. The system includes pre-charged R-410A No-Vac Quick Connect lines, eliminating the need for vacuum pumps or refrigerant charging.
Q: Can it heat as well as cool?
A: Absolutely. This ductless heat pump system provides efficient year-round heating and cooling.
Q: What kind of rooms is this setup ideal for?
A: Perfect for two medium rooms (12Ks) and four smaller rooms (9Ks), all with individual temperature control.
Q: Why choose ceiling cassette air handlers?
A: They mount flush in the ceiling for a sleek, space-saving design and deliver 360° airflow for even comfort distribution.
Q: How efficient is it?
A: Built with DC inverter technology, offering high SEER2 efficiency, low noise, and energy savings.
Q: Who benefits most from this package?
A: Homeowners who want to condition six rooms at once with a balance of medium and small zones, while keeping installation DIY-friendly.
Maintenance Tips
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Clean or replace ceiling cassette filters every 1–3 months.
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Keep cassette panels and vents free of dust for smooth airflow.
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Inspect and clean outdoor condenser coils regularly.
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Check refrigerant lines, insulation, and connections for wear.
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Schedule annual professional service to maintain reliable multi-zone performance and energy efficiency.
