MRCOOL DIY 5th Gen 27,000 BTU 4‑Zone Ductless Mini Split Heat Pump System (6K + 9K + 12K Air Handlers with 16 ft QuickConnect Line Sets)

MRCOOL DIY 5th Gen 27,000 BTU 4‑Zone Ductless Mini Split Heat Pump System (6K + 9K + 12K Air Handlers with 16 ft QuickConnect Line Sets)

The MRCOOL DIY® 5th Gen 27,000 BTU 4‑Zone Ductless Mini Split Heat Pump System offers versatile heating and cooling tailored to multiple rooms in your home with true DIY installation ease. This system pairs a 27,000 BTU outdoor condenser with three indoor air handlers — a 6,000 BTU, a 9,000 BTU, and a 12,000 BTU unit — providing zoned comfort for areas of varying sizes, such as bedrooms, home offices, living spaces, and bonus rooms.

Installation is made simple with pre‑charged QuickConnect® line sets, which come factory sealed with R‑454B refrigerant, removing the need for vacuum pumps or professional HVAC tools. A DIYPRO® communication cable simplifies electrical hookup, making setup accessible with basic tools. This design empowers homeowners to install their own system with minimal stress and cost.

Each indoor unit includes its own wireless remote, so you can independently adjust temperature settings for each zone. Utilizing advanced DC inverter technology, the system maintains efficient, quiet performance year‑round for both heating and cooling. Smart control features allow remote access and integration with modern smart home platforms.

Built for durability, the outdoor condenser is constructed with corrosion‑resistant components to withstand varied environmental conditions. Supported by strong manufacturer warranty coverage, this MRCOOL DIY® multi‑zone system combines energy‑efficient performance, zoned comfort, and homeowner‑friendly installation into one comprehensive HVAC solution.

Features

• Zoned comfort with four independently controlled heating and cooling zones

• Includes indoor air handlers: 6,000 BTU, 9,000 BTU, and 12,000 BTU units

• DIY‑friendly installation with pre‑charged QuickConnect® line sets

• Uses R‑454B refrigerant with lower environmental impact

• Quiet and efficient DC inverter compressor technology

• Wireless remote controls included for independent zone management

• Smart control capable — remote app and voice assistant ready

• Corrosion‑resistant outdoor unit construction for durability

• Ideal for residential multi‑room HVAC applications

Specifications

• Voltage: 208/230V
• Phase: Single Phase
• Zones Supported: Up to 4
• Refrigerant: R-454B
• Condenser Max 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 | 208/230V | 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.

✔ (1) MRCOOL® DIY® 9K BTU Wall-Mounted Air Handler

• Model: DIY-09-HP-WMAH-230D25-O

• Ideal for rooms up to ~350 sq. ft.

✔ (1) MRCOOL® DIY® 12K BTU Wall-Mounted Air Handler

• Model: DIY-12-HP-WMAH-230D25-O

• Ideal for rooms up to ~550 sq. ft.

✔ (3) MRCOOL® DIY® 16 ft QuickConnect® Line Sets

• Model: DIY16-1438-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 DIY® QuickConnect® line sets come factory-sealed and pre-charged.

Can each room be controlled independently?

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

Is this system smart-home compatible?

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

Is R-454B refrigerant future-ready?

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