Collection: MRCOOL® DIY® 5th Gen Multi Zone

The MRCOOL 5th Generation Multi-Zone DIY series is the industry’s first true whole-home ductless HVAC system designed for homeowners. With pre-charged QuickConnect® line sets, smart controls, flexible indoor unit styles, and R-454B next-gen refrigerant, you can heat and cool multiple rooms without hiring an HVAC installer or handling refrigerant.

Choose from 2-zone, 3-zone, 4-zone, and 6-zone configurations to match the way your home is actually used—bedrooms, living areas, sunrooms, basements, shops, and detached spaces. Every system uses factory-sealed line sets and advanced inverter technology to deliver quiet performance, lower energy bills, and reliable comfort in hot or cold climates.

What Size Multi-Zone System Do I Need?

• 2-Zone = 200–800 sq ft

• 3-Zone = 800–1,400 sq ft

• 4-Zone = 1,200–2,000 sq ft

• 5-6 Zone = 1,500–2,500 sq ft

Insulation, ceiling height, sun exposure, and room count affect sizing.

• 5th Generation R-454B refrigerant platform

• No-Vac QuickConnect® pre-charged lines — no vacuum pump

• SmartHVAC™ App + Alexa® / Google Assistant® voice control

• Multi-room comfort with individual temperature control

• Up to 20.5 SEER2 and ultra-quiet inverter compressors

• Compatible with wall mounts or OuttaSight® ceiling cassettes

Whether you’re upgrading an entire home, finishing a basement, remodeling a rental, or expanding a shop or office, MRCOOL Multi-Zone DIY systems provide the most reliable, future-ready HVAC solution available for true do-it-yourself installation.