Mr. Cool DIY 18,000 BTU 5th Gen 3 Zone Multi-Zone Outdoor Unit - R454B

MRCOOL® DIY-MULTI3-18HP230D-O DIY® 18K BTU R-454B Multi-Zone Ductless Mini-Split Condenser
The DIY-MULTI3-18HP230D-O 5th Generation MRCOOL® DIY® 18K BTU Multi-Zone Ductless Mini-Split Condenser offers efficient, customizable heating and cooling for up to three rooms totaling 750 sq ft. Designed for true DIY installation, it requires no HVAC professional and achieves an impressive 23.9 SEER2 and 10 HSPF2-4 for energy-smart performance. Supporting up to three air handlers, it pairs with MRCOOL® Quick Connect® pre-charged line sets (sold separately) filled with eco-friendly R-454B refrigerant—eliminating the need for vacuuming. Control is simple with the SmartHVAC app, wireless remote, or voice commands via Amazon Alexa and Google Assistant, allowing you to adjust settings, set schedules, and monitor performance. Backed by a limited lifetime replacement warranty (with MRCOOL® Care Program enrollment), plus 7-year compressor and 5-year parts coverage, this condenser delivers long-term reliability, efficiency, and comfort.

General Information
System Type: Multi-zone ductless mini-split condenser
Model: DIY-MULTI3-18HP230D-O -MRCOOL® DIY® 18K BTU Multi-Zone
Capacity: 18,000 BTU Heating & Cooling
Zones Supported: Up to 3 air handlers
Total Room Size: Up to 750 sq ft combined
Efficiency Ratings: 23.9 SEER2 / 10 HSPF2-4
Refrigerant: R-454B (pre-charged Quick Connect® line sets compatible, sold separately)

Key Features
High Efficiency: 23.9 SEER2 and 10 HSPF2-4 ratings for energy savings
DIY Installation: No professional tools or skills required
Eco-Friendly Refrigerant: R-454B for reduced environmental impact
Multi-Zone Support: Connect up to 3 air handlers for whole-home comfort
Smart Controls: App, remote, and voice integration with Alexa & Google Assistant
Custom Comfort: Schedule, temperature, and mode control via SmartHVAC app
Warranty Protection: Limited lifetime replacement, 7-year compressor, 5-year parts

Included Components
DIY-MULTI3-18HP230D-O -MRCOOL® DIY® 18K BTU multi-zone condenser

Ideal For
Homeowners needing efficient, DIY-installed multi-zone heating and cooling for up to 3 rooms without hiring an HVAC professional. Perfect for energy savings, flexibility, and smart control.