MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini-Split Condenser 230V – Up to 3 Zones | DIY-MULTI3-18HP230D-O
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MRCOOL® DIY® 5th Gen 18,000 BTU Multi-Zone Mini-Split Condenser – Up to 3 Zones, 230V
The MRCOOL® DIY® 5th Gen 18,000 BTU Multi-Zone Condenser is a premium outdoor unit designed to heat and cool up to 3 zones simultaneously with a combined capacity of 18,000 BTU. With an industry-leading 23.9 SEER2 rating and Energy Star certification, it delivers exceptional efficiency across multiple rooms — all with true DIY installation. No HVAC license, vacuum pump, or professional tools required.
Why Choose MRCOOL DIY® 5th Gen Multi-Zone?
- Up to 3 Independent Zones — Heat and cool up to 3 rooms simultaneously, each with its own temperature control.
- 23.9 SEER2 — Premium Efficiency — One of the highest efficiency ratings available, delivering significant energy savings year over year.
- Energy Star Certified — May qualify for federal tax credits and utility rebates.
- America’s #1 DIY Mini Split — The most trusted DIY mini split brand in the nation, built for quick setup and long-term reliability.
- DIY QuickConnect® Compatible — Works with MRCOOL pre-charged QuickConnect® line sets (sold separately) for a fast, vacuum-free installation.
- Eco-Friendly R-454B Refrigerant — Lower Global Warming Potential (GWP) than R-410A for better efficiency and a reduced environmental footprint.
- 172.2 ft. Max Line Set Length — Exceptional placement flexibility for multi-room installations across large homes.
- Smart Connectivity — Control via the SmartHVAC app (iOS & Android), or hands-free with Amazon Alexa or Google Assistant.
- Quiet Operation — Runs at just 60 dB(A) outdoors for minimal disruption.
- Best-in-Class Warranty — 7-year compressor warranty + 5-year parts warranty.
- Certified Excellence — Energy Star Certified, UL Listed, ETL Listed, AHRI Certified.
Product Overview
- 🏠 Maximum Zones: 3
- 💪 Total Capacity: 18,000 BTU
- 🔧 Installation: DIY — No Professional Required
- ⚡ Voltage: 208-230V
- 🌿 Energy Star Certified — May qualify for federal tax credits & utility rebates
- ⭐ Certification: Energy Star, UL Listed, ETL Listed, AHRI Certified
- 🧄 Refrigerant: R-454B
- ⚠️ Note: Air handlers and line sets sold separately
Specifications & Dimensions
| Capacity & Performance | |
|---|---|
| Cooling Capacity | 18,000 BTU |
| Heating Capacity | 18,000 BTU |
| Maximum Zones | 3 |
| SEER2 | 23.9 |
| EER2 | 13.0 |
| HSPF2-4 | 10.0 |
| HSPF2-5 | 7.8 |
| Cooling Range | -13°F to 122°F outdoor |
| Heating Range | -13°F to 75°F outdoor |
| Outdoor Noise Level | 60 dB(A) |
| Electrical Requirements | |
| Voltage | 208-230V |
| Phase | 1 |
| Cycle | 60 Hz |
| Max Fuse Breaker | 20A |
| Min Circuit Ampacity | 16A |
| Refrigerant & Piping | |
| Refrigerant Type | R-454B |
| Refrigerant Volume | 61.73 oz |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
| Max Line Set Length | 172.2 ft. |
| Dimensions & Weight | |
| Dimensions | 35.04" W x 13.46" D x 29.53" H |
| Weight | 101.63 lbs |
| Features | |
| Inverter | DC |
| Compressor Type | Rotary |
| Fan Only Option | Yes |
| Quiet Mode | Yes |
| Auto Cool | Yes |
| WiFi Compatibility | Yes |
| App Compatibility | Yes |
| Works with iOS | Yes |
| Works with Android | Yes |
| Certifications & Warranty | |
| Certifications | Energy Star Certified, UL Listed, ETL Listed, AHRI Certified |
| Parts Warranty | 5 Years |
| Compressor Warranty | 7 Years |
Shipping & Returns
🚚 Free Curbside Delivery
All MRCOOL orders ship free via FedEx Ground, FedEx Freight, or an equivalent trusted carrier. Delivery is curbside only — please arrange assistance in advance as carriers are not able to bring items inside your home.
Tracking & Delivery
Tracking information is typically provided within 3–5 business days of your order. Once received, please allow 1–2 business days for tracking details to update.
↩️ Return Policy
30-Day Return Window
Returns must be requested within 30 days of your delivery date. We are unable to accept return requests after this period.
Return Conditions
To qualify for a return, items must be unused and uninstalled, and in original packaging including box and pallet.
Restocking Fee
A 35% restocking fee applies to all approved returns.
📄 View Full Shipping Policy | 📄 View Full Return & Refund Policy
Frequently Asked Questions
What air handlers are compatible with this condenser?
This condenser is compatible with MRCOOL DIY® 5th Gen wall-mount and cassette air handlers. The combined BTU of all connected air handlers must not exceed 18,000 BTU. Line sets are sold separately — choose the length needed for each zone.
Can I install it myself?
Yes. Use MRCOOL DIY® pre-charged QuickConnect® line sets (sold separately) for a vacuum-free installation. The only professional you’ll need is a licensed electrician for the electrical hookup.
Does this qualify for tax credits or rebates?
As an Energy Star certified system with a 23.9 SEER2 rating, this unit may qualify for the federal Residential Clean Energy Credit or utility-sponsored rebate programs. Check with your local utility provider and a tax professional for eligibility.
What is the maximum line set length per zone?
The maximum line set length is 172.2 ft., giving you excellent flexibility for placing air handlers across multiple rooms.
What is the warranty?
This condenser is backed by MRCOOL’s best-in-class warranty:
- 7-Year Compressor Warranty
- 5-Year Parts Warranty
Recommended BTU By Room Size
Use this guide to size each individual zone — the combined BTU of all air handlers must not exceed 18,000 BTU total.
| BTU Per Zone | Recommended Room Size (Sq. Ft.) |
|---|---|
| 6,000 BTU | Up to 150 sq. ft. |
| 9,000 BTU | 151–350 sq. ft. |
| 12,000 BTU | 351–500 sq. ft. |
Example: A 3-zone setup could use three 6,000 BTU air handlers (3 × 6K = 18K total). Actual performance may vary depending on insulation, ceiling height, windows, and climate zone.
