MRCOOL DIY 5th Gen Mini Split - 4-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 9K + 9K + 9K + 9K Wall Mount Air Handlers - DIY5-4Z-36HP-9K9K9K9K
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 36K BTU 4-Zone system includes four 9K wall mounted 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 23 and 9.9 HSPF2-4 for energy-efficient year-round comfort.
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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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Even, Balanced Comfort: This 36,000 BTU 5th Gen system with four 9K wall units provides perfectly even heating and cooling across multiple mid-sized rooms.
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True Multi-Zone Efficiency: Each 9K air handler can operate independently, letting you personalize comfort and reduce energy waste.
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DIY-Friendly Design: Pre-charged lines and easy quick-connect fittings make it ideal for homeowners who want professional-grade performance without a technician.
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Quiet & Reliable: The inverter compressor ensures consistent temperature control with minimal noise and low energy consumption.
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Smart Control: Integrated Wi-Fi allows full control via the MRCOOL app, Alexa, or Google Assistant—so you can manage every zone effortlessly.
Q&A
Q: What is the MRCOOL DIY5-4Z-36HP-9K9K9K9K system?
A: It’s a 4-zone, 36,000 BTU ductless mini split air conditioner and heat pump from MRCOOL’s 5th Generation DIY Series, designed for efficient, customizable comfort.
Q: What air handler sizes are included?
A: This setup includes four 9,000 BTU wall-mounted air handlers—perfect for evenly conditioning multiple small to medium rooms.
Q: Is installation DIY-friendly?
A: Yes. The pre-charged Quick Connect lines make installation simple for homeowners without needing professional HVAC tools or expertise.
Q: Does it provide both heating and cooling?
A: Yes. It functions as both an air conditioner and a heat pump, offering year-round temperature control.
Q: Can each zone be controlled separately?
A: Absolutely. Each zone has independent settings with remote and Wi-Fi smart control via the MRCOOL SmartHVAC app, Alexa, or Google Assistant
Maintenance Tips
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Clean filters monthly — Rinse each indoor air handler’s filter with lukewarm water, dry fully, and reinstall for efficient airflow.
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Dust indoor units regularly to prevent buildup that can reduce performance.
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Inspect outdoor condenser coils every 3–6 months; remove debris, dirt, and leaves gently.
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Maintain at least 24 inches of clearance around the condenser for proper airflow.
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Flush condensate drain lines periodically with a mild vinegar solution to avoid clogs or odors.
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Check line set insulation yearly for cracks or wear to maintain cooling efficiency.
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Use “Fan Only” or self-cleaning mode after cooling to prevent mold and moisture buildup.
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Monitor operation via the MRCOOL SmartHVAC app for performance alerts and easy system management.
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Run all zones evenly to ensure balanced cooling and reduce compressor strain.
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Schedule annual professional maintenance to check refrigerant pressure, wiring, and connections.
