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What Size MRCOOL Mini Split Do I Need?
MRCOOL Mini Split Line Set Length Limits
Custom Comfort for Three Zones — MRCOOL DIY 5th Gen 18,000 BTU 3-Zone System
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 versatile 18k multi-zone condenser with three wall-mounted air handlers (6k + 6k + 6k), delivering year-round heating and cooling for up to 600 square feet—no ductwork required.
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.
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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23.9 SEER2 / 10 HSPF2 efficiency
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Individual zone control
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Dry Mode for humidity reduction
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Follow Me® remote function
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7-year compressor / 5-year parts warranty
Upgrade to whole-home comfort—without the ductwork. The MRCOOL DIY 18k 3-Zone system puts you in control.