MRCOOL DIY 5th Gen Mini Split - 4-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 9K + 9K Wall Mount Air Handlers - DIY5-4Z-36HP-12K12K9K9K

MRCOOL DIY 5th Gen Mini Split - 4-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 12K + 9K + 9K Wall Mount Air Handlers - DIY5-4Z-36HP-12K12K9K9K

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 two 12K and two 9K 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 23 and 9.9 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

• Versatile Multi-Room Coverage: The 36,000 BTU system with dual 12K and dual 9K wall units is ideal for homes with both medium and smaller rooms, balancing comfort across diverse spaces.

• Efficient Zoning: Each air handler operates independently, giving you precise control over temperature and energy use in each zone.

• DIY Installation Ready: Designed for homeowners, the pre-charged Quick Connect lines eliminate the need for special tools or professional installation.

• Energy-Saving Inverter Technology: The variable-speed compressor maintains consistent comfort while minimizing energy consumption and noise.

• Smart Comfort Control: Wi-Fi capability lets you manage all four zones using the MRCOOL app, Alexa, or Google Assistant for ultimate convenience.

Q&A

Q: What is the MRCOOL DIY5-4Z-36HP-12K12K9K9K?
A: It’s a 4-zone, 36,000 BTU ductless mini split system from MRCOOL’s 5th Generation DIY Series, offering efficient heating and cooling for multiple rooms.

Q: What sizes are the indoor air handlers?
A: The system includes two 12,000 BTU and two 9,000 BTU wall-mounted air handlers, ideal for small to medium-sized spaces.

Q: Is installation DIY-friendly?
A: Yes. The pre-charged Quick Connect lines allow easy homeowner installation with no special tools or HVAC experience needed.

Q: Does it heat and cool?
A: Absolutely. It functions as both an air conditioner and a heat pump, providing reliable comfort year-round.

Q: Can I control each zone separately?
A: Yes. Each zone has independent temperature settings with Wi-Fi smart control via the MRCOOL SmartHVAC app, Alexa, or Google Assistant.

Maintenance Tips

• Clean filters monthly — Wash each indoor air handler’s filter with lukewarm water, dry completely, and reinstall for smooth airflow.

• Dust indoor units regularly to prevent buildup that can reduce efficiency.

• Inspect outdoor condenser coils every 3–6 months and remove dirt or debris carefully.

• Maintain 24 inches of clearance around the condenser for proper ventilation.

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

• Check line set insulation annually to ensure it’s intact and undamaged.

• Use “Fan Only” or self-cleaning mode after cooling to dry coils and avoid mildew.

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

• Distribute zone use evenly to prevent overworking the 12K units and ensure balanced comfort.

• Schedule annual professional servicing to inspect refrigerant levels, wiring, and connections.