MRCOOL® DIY 4th Generation 18K BTU 2-Zone Ductless Heat Pump Condenser
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MODEL: DIY-MULTI2-18HP230C
Flexible, Efficient Climate Control for 2 Separate Spaces
The MRCOOL® DIY 4th Generation 18K BTU 2-Zone Ductless Heat Pump Condenser brings next-level flexibility and performance to your home’s comfort system. Designed to support two separate zones with independent air handlers, this multi-zone condenser provides both efficient heating and cooling with an impressive 21 SEER efficiency rating and reliable heating performance in temperatures as low as -13°F.
Perfect for garages, bedrooms, basements, offices, or additions, this system delivers whisper-quiet, energy-saving operation paired with DIY-friendly installation using MRCOOL®'s Pre-Charged Quick Connect® Line Sets. These pre-charged, no-vacuum-required lines come with quick connectors so homeowners can handle installation confidently with just a pair of wrenches.
The Gold Fin® corrosion-resistant condenser coating ensures long-lasting durability, even in harsh coastal climates. Fully compatible with the SmartHVAC® app, Amazon Alexa, and Google Assistant, this system gives you total control over your home’s comfort from anywhere.
And for extra peace of mind? It’s the only multi-zone condenser on the market with a limited lifetime compressor warranty.
Why You’ll Love It
✅ Multi-Zone Flexibility — Comfort control for two separate rooms or zones with one outdoor condenser
✅ True DIY Installation — Pairs with Pre-Charged Quick Connect® Line Sets; no vacuuming, no special tools, no pro needed
✅ High-Efficiency SEER 21 Performance — Keeps energy costs low while maintaining year-round comfort
✅ Operates in Extreme Cold — Heats reliably down to -13°F
✅ Gold Fin® Condenser Protection — Rust-resistant for long-lasting performance in humid or coastal areas
✅ Smart Control Ready — Works with SmartHVAC® app, Alexa, and Google Assistant
✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor, and 5-Year Parts Warranty
✅ Quiet Twin-Rotary DC Inverter Compressor — Smooth, efficient, and ultra-quiet operation
What’s Included:
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MRCOOL® 18K BTU 2-Zone 4th Gen Multi-Zone Condenser (208-230V)
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MRCOOL® Warranty Documents
Specifications
Specifications at a Glance
| Attribute | Details |
|---|---|
| Cooling Capacity (BTU) | 18,000 |
| Heating Capacity (BTU) | 19,000 |
| Voltage | 208-230V |
| Phase | 1 |
| Cycle | 60 Hz |
| Zone Capacity | 2 |
| Refrigerant Type | R-410A |
| Refrigerant Volume (oz) | 65.26 |
| SEER / SEER2 | 21 / 21.2 |
| HSPF (4/5) | 10.6 / 8.6 |
| EER / EER2 | 12.5 / 12.5 |
| Max Fuse Breaker (A) | 25 |
| Min Circuit Ampacity (A) | 18 |
| Min Ambient Cooling (°F) | 5 |
| Min Ambient Heating (°F) | -13 |
| Max Total Line Set Length (ft) | 123 |
| Liquid Line Size | 1/4” |
| Suction Line Size | 1/2” |
| Condenser Motor Type | Twin Rotary DC Inverter |
| Noise Level (dBA) | 59 |
| Wi-Fi Enabled | Yes |
| App Compatibility | iOS & Android |
| Remote Control Included | No (via paired air handlers) |
| Warranty | Lifetime Compressor (with registration), 7-Year Compressor, 5-Year Parts |
| Net Dimensions (WxHxD) | 35.04” x 26.50” x 13.46” |
| Gross Dimensions (WxHxD) | 40.94” x 29.33” x 17.64” |
| Net Weight | 100.53 lbs |
| Gross Weight | 111 lbs |
Room Size & BTU Coverage Guide
Choosing the right BTU (British Thermal Unit) output ensures your space stays consistently comfortable all year round.
| BTU Rating | Ideal Combined Room Size |
|---|---|
| 18,000 | 600–800 sq. ft. |
| 27,000 | 900–1,200 sq. ft. |
| 36,000 | 1,200–1,500 sq. ft. |
| 48,000 | 1,500–2,000 sq. ft. |
Important:
Always consider additional factors such as ceiling height, insulation quality, sun exposure, number of windows, climate, and the number of heat-producing appliances in your space when choosing the right system.
What You Need for a Complete System
This condenser requires pairing with:
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Compatible MRCOOL® DIY® 4th Gen Multi-Zone Air Handlers
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Pre-Charged Quick Connect® Line Sets (sold separately)
Optional Accessories:
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MRCOOL® Wall Mount Brackets or Ground Pads for Condenser
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Line Sets Coupler Kits
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Additional Line Sets
Installation
Installation & Manuals
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