The MRCOOL DIY 5th Gen 55,000 BTU 6-Zone Ceiling Cassette Mini-Split System is the largest capacity DIY unit available, capable of heating and cooling up to six individual zones with precision and efficiency. Designed for powerful whole-home performance, it combines a high-output condenser with your choice of low-profile ceiling cassette air handlers — all with smart control and DIY installation in mind.
This system supports any combination of 6K, 9K, 12K, and 18K ceiling cassettes, allowing full customization for bedrooms, living rooms, garages, offices, or large open spaces. With a 21.5 SEER2 rating, it maximizes efficiency while delivering serious comfort even in extreme weather conditions.
Whether you’re retrofitting an older home or building out a modern multi-room system, this DIY 6-zone setup offers unmatched versatility — without the need for a pro HVAC installer.
Key Features:
-
Supports six indoor zones with a single 55K condenser
-
Compatible with 6K, 9K, 12K, and 18K ceiling cassette units
-
21.5 SEER2 energy efficiency for lower utility bills
-
Ideal for large homes, offices, shops, or multi-room spaces
-
Flush-mounted ceiling cassettes blend seamlessly into any décor
-
DIY installation with included quick-connect fittings
-
Operates in extreme temperatures: heats to -13°F, cools to 122°F
-
App, Alexa, and Google Assistant smart control integration
-
Corrosion-resistant Gold Fin® condenser coating
-
Backed by 5-year parts and 7-year compressor warranty
Includes one 55K condenser and six ceiling cassette air handlers in the configuration of your choice.
