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What Size MRCOOL Mini Split Do I Need?
MRCOOL Mini Split Line Set Length Limits
Custom Comfort for Five Zones — MRCOOL DIY 5th Gen 42,000 BTU Multi-Zone System
Achieve perfect temperatures in five separate areas with the MRCOOL DIY 5th Gen 42k BTU 5-Zone Ductless Mini Split. This complete system pairs a powerful 48k multi-zone condenser with five wall-mounted air handlers (6k + 6k + 6k + 6k + 18k), delivering year-round heating and cooling for up to 1,550 square feet—no ductwork required.
Coverage by Zone:
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18,000 BTU: Covers spaces up to 750 sq. ft. (great room, open concept living, master suite)
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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, craft room)
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6,000 BTU: Covers spaces up to 200 sq. ft. (fifth small room, hobby space, meditation room)
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Total Coverage: 1,550 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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Dry Mode for humidity reduction
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Follow Me® remote function
Upgrade to whole-home comfort—without the ductwork. The MRCOOL DIY 42k 5-Zone system puts you in control.