MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 6K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-12K6K6K6K

MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 6K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-12K6K6K6K

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

• Customize mini-split system: choose the perfect line set length for each zone just above the “Add to Cart” button.
• Ultra-Efficient Cooling & Heating: Enjoy up to 21.8 and 10 HSPF2-4 for energy-efficient year-round comfort.
• DIY-Friendly QuickConnect® Installation: No vacuuming or professional tools needed — pre-charged line sets make setup fast and simple.
• Smart Voice & App Control: Full control via SmartHVAC app, Alexa, Google Assistant, or included wireless remote.
• Eco-Conscious Refrigerant: Uses R-454B refrigerant with a low environmental impact.
• Industry-Leading Warranty: Includes 5-year parts, 7-year compressor, and lifetime replacement with MRCOOL® Care registration.

What our Experts Think

• Reliable 4-Zone Comfort: 48,000 BTU condenser with 12K + 6K + 6K + 6K air handlers delivers efficient heating and cooling across multiple rooms.

• Custom Temperature Control: Each zone operates independently for personalized comfort.

• DIY-Friendly Installation: Designed for quick, simple setup without professional assistance.

• Quiet & Energy-Efficient: Inverter technology provides low-noise operation and optimal energy use.

• Smart Control: Mobile app compatibility enables remote operation, scheduling, and monitoring.

• Durable Design: Corrosion-resistant condenser ensures long-term, reliable performance in any climate.

Q&A

Q: What type of system is the MRCOOL DIY5-4Z-48HP-12K6K6K6K?
A: It’s a 4-zone ductless mini split system from MRCOOL’s 5th Generation DIY Series, offering both heating and cooling for multi-room comfort.

Q: What is the total capacity of this system?
A: The system delivers a total capacity of 48,000 BTU, efficiently managing the climate in multiple zones.

Q: What are the sizes of the included indoor air handlers?
A: This package includes one 12,000 BTU air handler and three 6,000 BTU air handlers — ideal for balancing comfort across rooms of different sizes.

Q: Is this system designed for DIY installation?
A: Yes. It features MRCOOL’s patented pre-charged Quick Connect lines, allowing homeowners to install the system without special HVAC tools or professional assistance.

Q: Can each indoor unit be controlled individually?
A: Yes, each air handler operates independently, giving you precise temperature control for each room or zone.

Q: Does it provide heating as well as cooling?
A: Absolutely. The system includes a high-efficiency heat pump that delivers reliable heating in winter and cooling in summer.

Q: What are the key benefits of this 4-zone configuration?
A: Easy installation, quiet operation, Wi-Fi smart controls, energy efficiency, and flexible zoning to customize comfort for multiple spaces.

Maintenance Tips

• Clean indoor air filters monthly — Rinse each air handler’s filter with lukewarm water, dry thoroughly, and reinstall to maintain optimal airflow and energy efficiency.

• Wipe down indoor units with a soft, dry cloth regularly to prevent dust buildup that can affect cooling performance.

• Inspect the outdoor condenser coils every 3–6 months; gently remove dirt and debris using a soft brush or compressed air.

• Keep condenser area clear — Maintain at least 24 inches of open space around the outdoor unit for proper ventilation.

• Flush condensate drain lines periodically with a mild vinegar solution to prevent clogs, odors, and moisture overflow.

• Check insulation on line sets annually to ensure it’s secure and undamaged for efficient temperature transfer.

• Use self-cleaning or dry mode on indoor units after cooling to prevent mold or bacteria buildup inside the coils.

• Run the “Fan Only” mode for 15–20 minutes after heavy use to help dry out internal moisture and prolong component life.

• Monitor system operation via the MRCOOL SmartHVAC app for early detection of irregularities or performance issues.

• Schedule a yearly professional inspection — have a certified HVAC technician verify refrigerant pressure, connections, and system health.

• Check mounting brackets and connections regularly to ensure all indoor units are secure and vibration-free.

• Balance zone usage — distribute cooling or heating evenly among the four zones to avoid overloading one area and extend compressor life.