MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 9K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-12K9K6K6K

MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 9K + 6K + 6K Wall Mount Air Handlers - DIY5-4Z-48HP-12K9K6K6K

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 Comfort: 48,000 BTU condenser with 12K + 9K + 6K + 6K air handlers delivers consistent heating and cooling across multiple rooms.

• Personalized Temperature Control: Each zone can be set independently for customized comfort.

• DIY-Friendly Installation: Designed for simple setup without professional assistance, saving time and cost.

• Quiet & Energy-Saving: Inverter technology ensures whisper-quiet operation and improved efficiency.

• Smart Operation: Compatible with mobile apps for easy remote control and scheduling.

• Durable Build: Corrosion-resistant condenser provides long-lasting reliability in any climate.

Q&A

Q: What type of system is the MRCOOL DIY5-4Z-48HP-12K9K6K6K?
A: It’s a 4-zone ductless mini split air conditioner and heat pump from MRCOOL’s latest 5th Generation DIY Series, built for easy self-installation and efficient whole-home comfort.

Q: What indoor air handlers are included in this system?
A: This configuration includes one 12,000 BTU, one 9,000 BTU, and two 6,000 BTU wall-mounted air handlers, perfect for serving rooms of different sizes.

Q: How difficult is the installation process?
A: The system is specifically designed for DIY installation. Its pre-charged Quick Connect line sets eliminate the need for vacuuming or special HVAC tools, making setup simple and cost-effective.

Q: Does it both heat and cool?
A: Yes. The MRCOOL DIY 5th Gen system functions as both an air conditioner and a heat pump, providing reliable performance all year round.

Q: Can each zone be controlled independently?
A: Yes. Each air handler includes its own remote and smart Wi-Fi capability, so you can adjust temperatures and settings individually for each zone.

Q: What are some key features of this model?
A: Highlights include energy-efficient inverter technology, quiet operation, smartphone control via the MRCOOL app, and compatibility with Alexa and Google Assistant.

Maintenance Tips

• Clean filters monthly — Wash each indoor air handler’s filter with lukewarm water and dry completely to maintain peak efficiency.

• Wipe indoor units with a soft cloth to prevent dust buildup and airflow restriction.

• Inspect outdoor condenser coils every 3–6 months; clear away leaves, dirt, and debris gently.

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

• Flush condensate drain lines with a mild vinegar solution every few months to prevent clogs and odors.

• Check line set insulation annually for wear or sun damage to ensure proper refrigerant efficiency.

• Use “Fan Only” or self-cleaning mode after cooling to remove moisture and prevent mold.

• Monitor system performance via the MRCOOL SmartHVAC app for alerts and maintenance tracking.

• Balance zone use to avoid overloading the 12K or 9K air handlers and maintain even comfort.

• Schedule professional maintenance annually for refrigerant, wiring, and connection checks.