MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 9K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-18K9K6K6K

MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 9K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-18K9K6K6K

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

• Efficient 4-Zone System: 48,000 BTU condenser with 18K + 9K + 6K + 6K air handlers provides balanced heating and cooling for multiple rooms.

• Custom Comfort: Each zone can be independently controlled for personalized temperature settings.

• DIY-Friendly Installation: Simple, tool-free setup designed for homeowners—no professional needed.

• Quiet & Energy-Efficient: Inverter technology ensures quiet operation and optimized energy savings.

• Smart Connectivity: Mobile app compatibility allows easy remote control and scheduling.

• Built to Last: Corrosion-resistant condenser delivers dependable, long-term performance in all climates.

Q&A

Q: What type of system is the MRCOOL DIY5-4Z-48HP-18K9K6K6K?
A: It’s a 4-zone ductless mini split air conditioner and heat pump from MRCOOL’s 5th Generation DIY Series, designed for efficient, customizable home climate control.

Q: What is the total system capacity?
A: This system provides 48,000 BTU total capacity, effectively heating and cooling multiple rooms at once.

Q: What indoor air handlers are included in this configuration?
A: The package comes with one 18,000 BTU, one 9,000 BTU, and two 6,000 BTU wall-mounted air handlers — ideal for rooms of various sizes.

Q: Can this system be installed without professional help?
A: Yes. It uses MRCOOL’s DIY-friendly Quick Connect pre-charged lines, allowing homeowners to complete installation without HVAC tools or technicians.

Q: Does it offer both heating and cooling functions?
A: Yes. This mini split includes a high-efficiency heat pump that provides dependable heating in winter and powerful cooling in summer.

Q: Are the zones independently controlled?
A: Absolutely. Each indoor unit has its own remote and smart control options, letting you set different temperatures for each room.

Q: What are some key features of the MRCOOL DIY 5th Gen system?
A: It offers smart Wi-Fi control, quiet operation, inverter technology for energy efficiency, and flexible comfort across four zones.

Maintenance Tips

• Clean filters monthly — Rinse each indoor air handler’s filter with lukewarm water and dry completely to maintain strong airflow.

• Wipe indoor units regularly to prevent dust buildup on vents and panels.

• Inspect outdoor condenser coils every 3–6 months and remove dirt, leaves, or obstructions gently.

• Keep condenser area clear with at least 24 inches of space on all sides for proper air circulation.

• Flush condensate drain lines using a mild vinegar solution to prevent mold or clogs.

• Check line set insulation annually to ensure it’s secure and not cracked or sun-damaged.

• Use self-cleaning or “Fan Only” mode after cooling to reduce interior moisture and mildew.

• Monitor performance via the MRCOOL SmartHVAC app for quick alerts and maintenance reminders.

• Distribute zone use evenly to reduce strain on the 18K and 9K units and prolong condenser life.

• Schedule annual service with a certified technician to check refrigerant levels, electrical integrity, and system balance.