Collection: MRCOOL® DIY® Single-Zone 5th Generation

MRCOOL DIY® 5th Gen Mini Splits are the easiest way to upgrade to a smart, energy-efficient HVAC system. With R-454B refrigerant and pre-charged lines, they’re perfect for garages, bonus rooms, and whole-home use.

MRCOOL DIY® 5th Generation Mini Split Systems – Ultimate DIY Comfort Redefined

Experience the next evolution in home climate control with the MRCOOL DIY® 5th Generation Mini Split Systems, the industry’s leading do-it-yourself HVAC solution. Designed with true homeowner installation in mind, this flagship MRCOOL® line sets a new standard for efficiency, smart technology, and simplified setup—no special tools, HVAC licenses, or vacuum pumps required.

Whether you’re cooling a single room or multiple zones, this innovative ductless mini split system makes it easier than ever to achieve year-round comfort—on your schedule and your budget.

What Sets the 5th Gen MRCOOL DIY Apart?

• Pre-Charged Quick Connect® Line Sets
  Every system includes a pre-charged R-454B refrigerant line set, eliminating the need for vacuuming or hiring a professional.
• New R-454B Refrigerant
  A more environmentally friendly, high-performance alternative to R-410A, used in previous models. This refrigerant delivers improved efficiency and aligns with evolving EPA regulations.
• Upgraded DIYPRO® Cable
  Enhanced safety and ease-of-installation with an all-in-one cable that simplifies electrical work while increasing outdoor durability.
• Smarter Climate Control
  Built-in WiFi and app control with voice compatibility (Alexa® and Google Assistant®), offering intuitive temperature management from anywhere.
• Energy Star Certified Efficiency
  With SEER2 ratings as high as 20.5, these systems reduce energy costs while maintaining consistent comfort in spaces up to 1,550 sq. ft. per zone.

Why Choose MRCOOL DIY Over Other Brands?

Unlike traditional mini splits that require licensed HVAC installers, the MRCOOL DIY® system is truly designed for homeowners. While other brands claim “easy installation,” MRCOOL delivers with pre-charged lines, proprietary connection technology, and unmatched support resources. Skip the scheduling, skip the service fees—get cooling and heating installed in a single afternoon.

Better Than Previous Generations

The 5th Generation improves on the already-popular 4th Gen with:

• A refrigerant shift to R-454B for better environmental compliance
• Updated electronics for more reliable WiFi and smart integration
• Streamlined installation with reinforced components and safety upgrades
• New wall sleeve and condensate drain routing optimizations

Shop the full MRCOOL DIY® 5th Generation Collection below—including single-zone and multi-zone options in a variety of BTU capacities. Whether it’s for your bedroom, garage, office, or whole home, this collection offers flexible, energy-efficient HVAC solutions that you can install yourself—no technician required.