MRCOOL DIY 5th Gen 27,000 BTU 4‑Zone Ductless Mini‑Split Heat Pump System (6K + 9K + 12K Air Handlers)

MRCOOL DIY 5th Gen 27,000 BTU 4‑Zone Ductless Mini‑Split Heat Pump System (6K + 9K + 12K Air Handlers)

The MRCOOL DIY® 5th Gen 27,000 BTU 4‑Zone Ductless Mini‑Split Heat Pump System is designed to deliver customized climate control across multiple rooms with true DIY installation convenience. Built around a 5th Generation 27,000 BTU multi‑zone condenser, this system supports up to four independent comfort zones — perfect for spaces like bedrooms, offices, bonus rooms, and other living areas where individualized temperature control matters. Combining multiple indoor units allows efficient, balanced cooling and heating without conditioning unused spaces.

Installation is straightforward thanks to MRCOOL’s QuickConnect® technology. The included line sets arrive factory-sealed and pre‑charged with R‑454B refrigerant, so no vacuum pumps, refrigerant handling, or licensed HVAC technicians are required to complete the setup. The included DIYPRO® communication cable simplifies electrical connections, streamlining the installation process and reducing setup time.

The system includes indoor units sized for mixed room capacities: a 6,000 BTU head for smaller rooms, a 9,000 BTU head for medium spaces, and a 12,000 BTU head for larger areas — meaning each zone delivers tailored comfort without unnecessary energy use. Each indoor unit operates independently, giving you precise control over temperature in each room. Premium features like corrosion‑resistant outdoor components and smart control compatibility ensure reliable, user‑friendly operation.

With its balanced performance, zoned comfort, and true DIY-friendly design, the MRCOOL DIY® 27 K multi‑zone mini‑split system is a smart solution for homeowners seeking efficient and customizable year‑round HVAC without professional installation.

Features

• Multi‑Zone Comfort: Four independently controlled zones for personalized heating and cooling

• Mixed Air Handler Configuration: Includes one 6 K BTU, one 9 K BTU, and one 12 K BTU wall‑mounted indoor air handlers

• DIY Installation: QuickConnect® line sets are pre‑charged with refrigerant — no vacuum pumps, gauges, or professional tools required

• Eco‑Friendly Refrigerant: Uses R‑454B, a next‑generation low global warming potential refrigerant

• Smart Control Capable: Designed for app control and smart-home voice assistant compatibility

• Quiet Operation: DC inverter technology supports smooth, quiet performance

• Gold Fin® Protection: Outdoor condenser built with corrosion-resistant coating for long-term durability

• Wireless Remotes: Included for easy control of each indoor unit.

Specifications

• Total System Capacity: 27,000 BTU
• Zones Installed: 3 (Supports up to 4 zones)
• SEER2: Up to 23
• HSPF2-4: Up to 9.9
• Refrigerant: R-454B
• Voltage: 208/230V (Single Phase)
• Max Breaker (Condenser): 25A
• Minimum Circuit Ampacity: 21A
• Inverter-Driven Compressor: Yes
• ENERGY STAR® Certified: Yes
• AHRI Certified: Yes

What’s Included

• ✔ MRCOOL® DIY-MULTI4-27HP230D-O
  27,000 BTU 4-Zone 5th Gen DIY® Multi-Zone Condenser (230V)
• ✔ (2) MRCOOL® DIY-06-HP-WMAH-230D25-O
  6,000 BTU Wall-Mounted Air Handlers (up to ~200 sq ft each)
• ✔ (1) MRCOOL® DIY-09-HP-WMAH-230D25-O
  9,000 BTU Wall-Mounted Air Handler (up to ~350 sq ft)
• ✔ (3) MRCOOL® DIY25-1438-O
  25 ft DIY® QuickConnect® Line Sets (1/4” x 3/8”)
• ✔ DIYPRO® communication cable
• ✔ Wireless remotes for each indoor unit
• ✔ Wall mounting hardware & installation accessories

📌 Smart phone not included

Frequently Asked Questions (FAQ's)

Q: Can I add another indoor unit later?

Yes. The condenser supports up to four indoor air handlers.

Q: Do I need HVAC tools or a license?

No. DIY® QuickConnect® technology eliminates vacuuming and refrigerant handling.

Q: Can each room be controlled separately?

Yes. Each zone operates independently through the MRCOOL® Smart HVAC Controller®.

Q: What warranty is included?

• 5-Year Parts Warranty
• 7-Year Compressor Warranty
• Limited Lifetime Replacement Warranty with MRCOOL® Care enrollment