MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 9K + 9K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-9K9K6K6K
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 BTU 4-Zone system includes one 24K, one 18K, one 9K and one 6K 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 21.8 and 10 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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Efficient 4-Zone System: 48,000 BTU condenser with 9K + 9K + 6K + 6K air handlers delivers balanced heating and cooling across multiple rooms.
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Individual Comfort: Each zone can be independently adjusted for personalized temperature control.
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DIY-Friendly Installation: Simple setup design eliminates the need for professional installation.
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Quiet & Energy-Efficient: Inverter technology ensures whisper-quiet operation and reduced energy costs.
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Smart Connectivity: Compatible with mobile apps for remote operation, scheduling, and monitoring.
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Durable Build: Corrosion-resistant condenser provides reliable performance in diverse climates.
Q&A
Q: What type of system is the MRCOOL DIY5-4Z-48HP-9K9K6K6K?
A: It’s a 4-zone, 5th Generation ductless mini split system that provides both air conditioning and heating using a heat pump.
Q: What is the total capacity of this system?
A: The system delivers a combined capacity of 48,000 BTU for multi-zone climate control.
Q: What are the sizes of the indoor air handlers?
A: This setup includes two 9,000 BTU and two 6,000 BTU wall-mounted air handlers, perfect for small to mid-sized rooms.
Q: Is the installation DIY-friendly?
A: Yes. The MRCOOL DIY Series comes with pre-charged Quick Connect lines that allow homeowners to install the system without special tools or professional HVAC help.
Q: Can each zone be controlled separately?
A: Absolutely. Each air handler has its own thermostat and remote, allowing independent temperature control for personalized comfort.
Q: Does this system work year-round?
A: Yes, it provides both efficient cooling during summer and heating during winter through its advanced inverter heat pump technology.
Q: What are the main advantages of this model?
A: Easy DIY installation, energy efficiency, quiet operation, Wi-Fi smart control compatibility, and zoned temperature customization.
Maintenance Tips
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Clean indoor air filters monthly — Rinse each zone’s air filter gently with lukewarm water and allow it to dry fully before reinstalling to maintain airflow and efficiency.
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Dust the indoor units regularly — Use a soft microfiber cloth to wipe down the air handler surfaces and louvers to keep air circulation smooth.
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Inspect outdoor condenser coils every 3–6 months and remove debris, dirt, or leaves using a soft brush or low-pressure air.
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Ensure clear airflow around the condenser — Keep at least 24 inches of clearance on all sides and remove nearby obstructions.
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Check condensate drain lines for blockages or mold buildup; flush with a mild vinegar solution every few months to prevent leaks.
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Inspect line set insulation annually to make sure it’s intact, properly sealed, and free from sun damage or cracks.
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Activate the self-cleaning mode on each indoor unit (if available) to reduce bacteria and mold formation inside the coil area.
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Run in “Fan Only” mode after cooling to dry the interior coils, minimizing moisture and odor issues.
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Monitor performance through the MRCOOL SmartHVAC app — it helps detect uneven cooling or system irregularities early.
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Schedule annual maintenance with a certified HVAC technician to verify refrigerant levels, electrical connections, and overall system condition.
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Check mounting brackets on wall units every few months to ensure they remain tight and vibration-free.
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Balance cooling across zones — avoid overusing one or two zones to help the condenser distribute load evenly and extend system lifespan.
