The MRCOOL DIY 5th Gen 36 K BTU 4-Zone Ductless Mini Split System with Ceiling Cassettes (6 K + 9 K + 12 K + 18 K) delivers precise, energy-efficient comfort for every room—without professional installation.

Perfect for mixed-size homes, this system includes:

• 1 × 6 K BTU cassette (~ 250 sq ft)

• 1 × 9 K BTU cassette (~ 375 sq ft)

• 1 × 12 K BTU cassette (~ 500 sq ft)

• 1 × 18 K BTU cassette (~ 750 sq ft)

Powered by a high-efficiency 36 K BTU 23 SEER2 inverter condenser, this MRCOOL DIY system provides year-round heating and cooling for roughly 1 ,800 sq ft of space.

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⚙️ Key Features

✅ DIY Installation — No HVAC Tech Needed

Patented Quick Connect® Line Sets come pre-charged with eco-friendly R-454B refrigerant, so you can install safely and easily with basic tools.

🌡️ Smart Control Anywhere

Adjust zones, set schedules, and monitor performance via the MRCOOL SmartHVAC App or hands-free with Amazon Alexa and Google Home.

💨 Low-Profile Ceiling Cassettes

Recessed design mounts between 16-inch joists for clean lines and quiet operation, delivering even airflow without taking wall space.

♻️ Energy-Efficient & Eco-Safe

DC inverter technology paired with R-454B refrigerant achieves 23 SEER2 efficiency and lowers utility costs and emissions.

🔒 Long-Term Protection

Includes a 7-Year Compressor Warranty, 5-Year Parts Warranty, and optional Lifetime Replacement Coverage through MRCOOL Care.
Gold Fin® coating guards against corrosion for long-lasting performance.

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💡 Why Homeowners Love This System

• Covers up to ≈ 1 ,800 sq ft across four zones

• Mix small, medium & large rooms for custom comfort

• Auto, Sleep & Dry modes for energy efficiency

• Quiet operation with filter alerts & self-diagnostics

• Smart Wi-Fi & voice integration for convenience

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📦 What’s Included

• (1) 36 K BTU MRCOOL DIY 5th Gen Condenser

• (1) 6 K BTU Ceiling Cassette

• (1) 9 K BTU Ceiling Cassette

• (1) 12 K BTU Ceiling Cassette

• (1) 18 K BTU Ceiling Cassette

• Pre-Charged DIY Quick Connect Line Sets & Couplers

• Remotes & Installation Manuals

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⚡ Technical Highlights

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💬 Customer Benefits

• Save $1 K – $3 K with DIY installation

• Free shipping & 0 % Affirm financing

• Lifetime technical support from MRCOOL

• Year-round comfort in every room

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🏁 The DIY Comfort Solution

The MRCOOL DIY 5th Gen 36 K BTU 4-Zone Mini Split (6 K + 9 K + 12 K + 18 K) offers smart, flexible comfort across four rooms of varying sizes.
Enjoy high-efficiency performance, smart connectivity, and true DIY installation that saves you thousands without sacrificing quality.

Powerful. Personalized. Professionally simple — MRCOOL DIY Direct.