MRCOOL DIY 5th Gen 27,000 BTU 4‑Zone Ductless Mini Split Heat Pump System (6K + 9K + 9K Air Handlers with 25 ft QuickConnect Line Sets)

MRCOOL DIY 5th Gen 27,000 BTU 4‑Zone Ductless Mini Split Heat Pump System (6K + 9K + 9K Air Handlers with 25 ft QuickConnect Line Sets)

The MRCOOL DIY® 5th Gen 27,000 BTU 4‑Zone Ductless Mini Split Heat Pump System (DIYM327HPW03D21) delivers efficient, zoned heating and cooling for multiple spaces in your home or workspace. Designed around a 27,000 BTU outdoor condenser and paired with three indoor wall‑mounted units — one 6,000 BTU and two 9,000 BTU air handlers — this system allows independent temperature control in up to four zones. This flexibility is ideal for bedrooms, living rooms, offices, bonus rooms, or other areas where personalized comfort is important.

Installation is streamlined with MRCOOL’s QuickConnect® technology. The included 25 ft line sets are factory‑charged and sealed with R‑454B refrigerant, so no vacuum pumps, refrigerant gauges, or special HVAC tools are required. A DIYPRO® communication cable simplifies the electrical connections, allowing you to complete installation using basic tools and household supplies with confidence.

Each indoor unit includes a wireless remote for independent control of temperature and settings. The system uses advanced DC inverter technology, delivering precise comfort with quieter operation and improved energy efficiency compared to traditional HVAC systems. Optional smart control capability expands convenience, enabling remote temperature management and integration with modern smart home systems.

Built for long‑term performance, the outdoor condenser is constructed with corrosion‑resistant materials that help ensure durability and reliable operation in various environments. Backed by comprehensive manufacturer warranties, this MRCOOL DIY® multi‑zone system combines powerful zoned comfort, energy‑efficient performance, and true DIY installation simplicity.

Features

• Multi‑Zone Comfort: Four independent zones for tailored temperature control

• Indoor Units Included: One 6,000 BTU and two 9,000 BTU wall‑mounted air handlers

• DIY‑Friendly Installation: Pre‑charged QuickConnect® line sets eliminate the need for vacuum pumps and professional tools

• 25 ft Line Sets: Three pre‑charged QuickConnect® line sets included for flexible unit placement

• Eco‑Friendly Refrigerant: Uses R‑454B refrigerant for improved environmental performance

• Quiet & Efficient Operation: DC inverter variable‑speed compressor

• Independent Wireless Remotes: Each indoor unit includes its own remote control

• Smart Control Ready: Compatible with smart HVAC app and voice assistant systems

• Corrosion‑Resistant Design: Outdoor unit built for long‑lasting durability

• Residential or Light Commercial Use: Ideal for homes, offices, and multi‑room applications

Specifications

• Voltage: 208/230V
• Phase: Single Phase
• Zones Supported: Up to 4
• Refrigerant: R-454B
• Condenser Max Fuse / Breaker: 35 Amps
• Condenser Minimum Circuit Ampacity: 30.5 Amps
• Installation: True DIY® — No HVAC license required

What’s Included

✔ MRCOOL® DIY® 4-Zone Outdoor Condenser

• Model: DIY-MULTI4-27HP230D-O

• 27,000 BTU | 230V | DC Inverter Heat Pump

• Max Breaker: 35A | Min Circuit Ampacity: 30.5A

✔ (1) MRCOOL® DIY® 6K BTU Wall-Mounted Air Handler

• Model: DIY-06-HP-WMAH-230D25-O

• Ideal for rooms up to ~200 sq. ft.

✔ (2) MRCOOL® DIY® 9K BTU Wall-Mounted Air Handlers

• Model: DIY-09-HP-WMAH-230D25-O

• Ideal for rooms up to ~350 sq. ft. each

✔ (3) MRCOOL® DIY® 25 ft QuickConnect® Line Sets

• Model: DIY25-1438-O

• Factory pre-charged with R-454B refrigerant

✔ Wireless remotes for each air handler

✔ DIY® QuickConnect® fittings

✔ Factory-sealed refrigerant system

📱 Smart phone not included

Frequently Asked Questions (FAQ's)

Can I install this system myself?

Yes. MRCOOL® DIY® systems are engineered specifically for homeowner installation.

Do I need HVAC tools or refrigerant handling?

No. The QuickConnect® line sets are factory-sealed and pre-charged.

Can each room be controlled independently?

Yes. Each air handler has its own thermostat, remote, and app control.

Is this system smart-home compatible?

Yes. Works with the MRCOOL® Smart HVAC Controller® app, Amazon Alexa, and Google Assistant.

Is R-454B refrigerant future-proof?

Yes. R-454B is more efficient and environmentally friendly than older refrigerants.