MRCOOL® 18k DIY 5th Generation 3 Zone Multi-Zone Mini-Split Condenser 230v
MODEL: DIY-MULTI3-18HP230D-O
Product Description
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 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 & 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.
Still Unsure?
Our MRCOOL-certified team is ready to help — message us anytime!
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)
Shipping Policy
At Cool Heat Direct, we offer free curbside delivery on all MRCOOL product orders via FedEx Ground, FedEx Freight, or trusted carriers depending on order size.
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Deliveries are made to the curbside — please arrange assistance for heavy or large items, as drivers do not carry items indoors or upstairs.
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Tracking details will be sent within 3–5 business days after placing your order.
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Freight shipments are scheduled directly by the carrier using the contact information you provide at checkout.
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Please inspect your shipment upon delivery and report any visible damage on the delivery receipt.
👉 Click here for our full Shipping Policy
Return Policy
We want you to love your purchase from Cool Heat Direct. If you need to return an item:
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Contact us within 30 days of delivery.
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Items must be unused, uninstalled, and in their original packaging.
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A 35% restocking fee applies to all approved returns.
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Accessories such as line sets, wall mounts, and couplers are non-returnable.
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Return shipping is the customer’s responsibility unless the item is damaged or defective on arrival.
To start a return, please email us at support@coolheatdirect.com with your order number and reason for return.
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