MRCOOL® DIY 4th Generation 18K BTU 2-Zone Ductless Heat Pump Condenser
Free Shipping
Warranty Protection
Trusted Returns Policy
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:
-
MRCOOL® 18K BTU 2-Zone 4th Gen Multi-Zone Condenser (208-230V)
-
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:
-
Compatible MRCOOL® DIY® 4th Gen Multi-Zone Air Handlers
-
Pre-Charged Quick Connect® Line Sets (sold separately)
Optional Accessories:
-
MRCOOL® Wall Mount Brackets or Ground Pads for Condenser
-
Line Sets Coupler Kits
-
Additional Line Sets
Installation
Installation & Manuals
Shipping & Returns
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.
-
Deliveries are made to the curbside — please arrange assistance for heavy or large items, as drivers do not carry items indoors or upstairs.
-
Tracking details will be sent within 3–5 business days after placing your order.
-
Freight shipments are scheduled directly by the carrier using the contact information you provide at checkout.
-
Please inspect your shipment upon delivery and report any visible damage on the delivery receipt.
Return Policy
We want you to love your purchase from Cool Heat Direct. If you need to return an item:
-
Contact us within 30 days of delivery.
-
Items must be unused, uninstalled, and in their original packaging.
-
A 35% restocking fee applies to all approved returns.
-
Accessories such as line sets, wall mounts, and couplers are non-returnable.
-
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.
Choose options