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What Size MRCOOL Mini Split Do I Need?
MRCOOL Mini Split Line Set Length Limits
Discreet Comfort for Three Zones — MRCOOL DIY 5th Gen 18,000 BTU Multi-Zone System with OuttaSight® Cassettes
Achieve perfect temperatures in three separate areas with the MRCOOL DIY 5th Gen 18k BTU 3-Zone Ductless Mini Split. This complete system pairs a powerful 27k multi-zone condenser with three OuttaSight® ceiling cassette air handlers (6k + 6k + 6k), delivering year-round heating and cooling for up to 600 square feet—no ductwork required. The flush-mounted cassettes disappear into the ceiling for a clean, unobtrusive look.
Coverage by Zone:
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6,000 BTU: Covers spaces up to 200 sq. ft. (home office, nursery, small bedroom, study)
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6,000 BTU: Covers spaces up to 200 sq. ft. (guest room, playroom, small den)
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6,000 BTU: Covers spaces up to 200 sq. ft. (additional small bedroom, hobby room)
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Total Coverage: 600 sq. ft.
True DIY Installation
No HVAC contractor required. Patented Quick Connect® line sets come pre-charged with eco-friendly R-454B refrigerant, so installation is simple, tool-free, and DIY-friendly. The cassettes fit neatly between 16" ceiling joists.
Discreet OuttaSight® Design
The one-way ceiling cassettes mount flush against the ceiling, keeping walls clear and preserving your room's aesthetics. Advanced filtration and an Elevation function make filter maintenance easy by lowering the panel for access.
Smart Control, Anywhere
Manage comfort from anywhere using the SmartHVAC app for iOS and Android. Adjust temperatures, set zone-specific schedules, or use voice commands with Amazon Alexa and Google Assistant.
Built to Last
The outdoor condenser features Gold Fin® anti-corrosion coating, ensuring durability in coastal or humid climates.
Key Features:
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23 SEER2 / 9.5 HSPF2 efficiency
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Individual zone control
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Quiet operation
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One-way ceiling cassette design
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Easy-access filter maintenance
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7-year compressor / 5-year parts warranty
Upgrade to discreet, whole-home comfort—without the ductwork. The MRCOOL DIY 18k 3-Zone OuttaSight® system puts you in control.