We’re excited to introduce the 5th Generation MRCOOL® DIY® 18k BTU Multi-Zone Ductless Mini-Split Condenser—our most advanced and convenient comfort solution yet. Designed for true do-it-yourself installation, this system eliminates the need for an HVAC professional. With an impressive SEER2 rating of 23.9 and HSPF2-4 rating of 10, it delivers energy savings while keeping your home comfortable year-round. This condenser can support up to three air handlers and heat or cool a combined space of up to 750 square feet—ideal for spare bedrooms, home offices, or small apartments. At the core of its simplicity is our patented pre-charged Quick Connect® line set, now filled with R-454B, a high-efficiency, environmentally friendly refrigerant. This system is designed to be sustainable, user-friendly, and cost-effective. Smart home compatibility is built in. With the Smart HVAC app, Amazon Alexa, or Google Home, you can manage temperature settings, set custom schedules, and monitor performance with ease—from anywhere, at any time. Total climate control is just a tap or voice command away. Every DIY® condenser comes backed with exceptional peace of mind. Backed by a 7-year compressor and 5-year parts warranty, the MRCOOL® DIY® 18K system offers dependable protection, with included eligibility for the MRCOOL® Care Program. With unmatched efficiency, eco-friendly design, and DIY simplicity, the MRCOOL® DIY® 5th Gen 18k BTU Multi-Zone system is the ultimate choice for personalized comfort.