MRCOOL® 18k DIY 5th Generation 3 Zone Multi-Zone Mini-Split Condenser 230v
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MODEL: DIY-MULTI3-18HP230D-O
DIY Multi-Zone Climate Control for Up to 3 Rooms (750 sq. ft.)
Take total control of your home’s comfort with the MRCOOL® 18K DIY® 5th Generation Multi-Zone Mini-Split Condenser — a high-performance, energy-efficient system designed for reliable heating and cooling across up to three separate rooms. Perfect for homes, apartments, basements, garages, or offices totaling up to 750 sq. ft.
Delivering a top-tier SEER2 rating of 23.9 and HSPF2-4 of 10, this 1.5-ton condenser offers outstanding efficiency and year-round savings. The game-changing Quick Connect® pre-charged line sets — now filled with eco-conscious R-454B refrigerant — allow for fast, clean, and fully DIY-friendly installation with no vacuuming, gauges, or professional assistance required.
Pair it with up to 3 MRCOOL® 5th Gen DIY® Air Handlers to personalize each room’s climate to your exact preference. Integrated Wi-Fi control via the SmartHVAC® app, Amazon Alexa, and Google Assistant lets you manage schedules, modes, and temperature settings remotely — or by voice command.
Engineered with durable, weather-resistant components and a quiet, efficient rotary inverter compressor, this unit ensures long-lasting, whisper-quiet operation at just 60 dBA. It’s backed by an exceptional Limited Lifetime Compressor Replacement Warranty (with registration), giving you total confidence in your investment.
Why You’ll Love It
✅ Controls Up to 3 Zones — Connects to three air handlers for flexible, multi-room heating and cooling.
✅ Seamless DIY Installation — Use MRCOOL® Quick Connect® pre-charged line sets for a no-vacuum, tool-free setup.
✅ Top Energy Efficiency — SEER2 23.9 and HSPF2-4 10 for lower energy bills and eco-friendly performance.
✅ Smart-Home Compatible — Control your system via the SmartHVAC® app, Alexa, and Google Assistant.
✅ Follow Me® Technology — Tracks temperature where you are, not just where the unit is.
✅ Ultra-Quiet, Reliable Operation — Rotary inverter compressor for low-noise, efficient comfort (60 dBA).
✅ Built-In Future-Ready Design — Features durable components and eco-conscious R-454B refrigerant.
✅ Industry-Leading Warranty — Limited Lifetime Compressor (with registration), 7-Year Compressor, and 5-Year Parts Warranty.
What’s Included:
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MRCOOL® 18K DIY® 5th Gen 3-Zone Mini-Split Condenser
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DIYPro™ Communication Cable
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Wireless Remote Control
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Installation Accessories
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MRCOOL® Warranty
Specifications
Specifications at a Glance
| Attribute | Details |
|---|---|
| BTU Capacity | 18,000 BTU |
| Voltage | 208/230V |
| Zones Supported | Up to 3 |
| SEER2 | 23.9 |
| HSPF2-4 / HSPF2-5 | 10 / 7.8 |
| Refrigerant Type | R-454B |
| Line Set Compatibility | MRCOOL® Quick Connect® |
| Max Line Set Length (ft) | 172.2 |
| Liquid Line Size | 1/4″ |
| Suction Line Size | 3/8″ |
| Sound Rating (dBA) | 60 |
| Wi-Fi Compatibility | Yes (SmartHVAC App, Alexa, Google Assistant) |
| Warranty | Limited Lifetime Compressor (registered), 7-Year Compressor, 5-Year Parts |
Installation
Installation & Guides
Room Size & BTU Coverage Guide
| BTU Rating | Ideal Coverage Area (Approx.) |
|---|---|
| 18,000 | 500 – 750 sq. ft. (up to 3 separate rooms) |
Important: When choosing your system, always factor in ceiling height, insulation, sun exposure, number of windows, climate, and heat-generating appliances.
What You Need for a Complete System
For full operation and optimal performance, pair this condenser with:
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MRCOOL® DIY® 5th Gen Multi-Zone Air Handlers (up to 3 total)
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MRCOOL® Quick Connect® Pre-Charged Line Sets (available in multiple lengths — sold separately)
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DIYPro™ Communication Cables (25ft included with each air handler)
Optional Accessories:
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MRCOOL® Wall Mount Bracket
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Additional Quick Connect® Line Sets
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Coupler Kits (for line set extensions)
Choose options