MRCOOL DIY 5th Gen Mini Split - 4-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 18K + 9K + 9K + 9K Wall Mount Air Handlers - DIY5-4Z-36HP-18K9K9K9K
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 one 18K and three 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 Climate Control: The 36,000 BTU 5th Gen condenser with 18K + 9K + 9K + 9K wall units delivers powerful heating and cooling for up to four zones.
-
Perfect Zone Balance: Ideal for homes needing one larger room (18K) and three smaller spaces (9K each) with independent temperature control.
-
DIY Installation Ready: Pre-charged quick-connect lines make setup simple—no vacuum pump or professional tools needed.
-
Efficient & Quiet: Inverter compressor and R-454B refrigerant ensure strong performance, lower energy bills, and whisper-quiet operation.
-
Smart Home Compatible: Control through the MRCOOL app, Amazon Alexa, or Google Assistant for effortless comfort management.
Q&A
Q: What type of system is this MRCOOL model?
A: It’s a 4-zone, 36,000 BTU ductless mini split air conditioner and heat pump from MRCOOL’s 5th Generation DIY Series, designed for efficient year-round comfort.
Q: What are the included air handler sizes?
A: The system includes one 18,000 BTU and three 9,000 BTU wall-mounted air handlers, ideal for medium to large rooms.
Q: Is the system DIY-installable?
A: Yes. MRCOOL’s pre-charged Quick Connect lines let homeowners install it easily without professional HVAC tools or services.
Q: Can each zone be controlled individually?
A: Yes. Each air handler has independent temperature control and supports smart Wi-Fi operation via the MRCOOL SmartHVAC app, Alexa, and Google Assistant.
Q: Does it provide both cooling and heating?
A: Absolutely. The heat pump technology delivers powerful cooling in summer and reliable heating in winter for all four zones.
Maintenance Tips
-
Clean air filters monthly — Wash each indoor unit’s filter with lukewarm water, dry fully, and reinstall for optimal airflow.
-
Wipe indoor units regularly to remove dust buildup from vents and surfaces.
-
Inspect outdoor condenser coils every 3–6 months; gently clear dirt, leaves, or debris.
-
Keep at least 24 inches of space around the condenser for proper ventilation.
-
Flush condensate drain lines with a mild vinegar solution every few months to prevent clogs or odors.
-
Check line set insulation annually to ensure it’s secure and undamaged for efficient cooling.
-
Use “Fan Only” or self-cleaning mode after cooling to reduce moisture and prevent mold.
-
Monitor performance via the MRCOOL SmartHVAC app for alerts and system efficiency tracking.
-
Balance zone usage to avoid overloading the 18K air handler and ensure even comfort.
-
Schedule annual maintenance to verify refrigerant levels, connections, and condenser condition.
