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.
⚙️ 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.
💡 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
📦 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
⚡ Technical Highlights
| Specification | Value |
|---|---|
| Cooling Capacity | 34 000 BTU |
| Heating Capacity | 36 000 BTU |
| Voltage | 208/230 V Single Phase |
| Refrigerant | R-454B |
| SEER2 / HSPF2-4 | 23 / 9.9 |
| Zones Supported | 4 |
| Compressor | DC Inverter Rotary |
| Noise Level | 64 dBA |
| Connectivity | Wi-Fi, Alexa, Google Home |
| Certifications | AHRI, ETL, Energy Star Certified |
💬 Customer Benefits
-
Save $1 K – $3 K with DIY installation
-
Free shipping & 0 % Affirm financing
-
Lifetime technical support from MRCOOL
-
reliable comfort throughout the year in every room
🏁 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 — this retailer.
Shipping Policy
Free Standard Shipping
We offer free standard shipping on all orders. Orders are processed within 1–2 business days and typically arrive within 5–7 business days.
Expedited Shipping
Expedited shipping options are available at checkout. Expedited orders placed before 12pm EST ship the same business day.
Order Tracking
Once your order ships you will receive a confirmation email with a tracking number. You can track your shipment at any time through our website or the carrier's portal.
International Shipping
We currently ship within the United States only. International shipping is not available at this time.
Return Policy
30-Day Returns
We accept returns within 30 days of delivery. Items must be unused, in their original packaging, and in the same condition as received.
How to Initiate a Return
Contact our support team at sales@homecrucial.com with your order number and reason for return. We will provide a prepaid return label within 1–2 business days.
Refunds
Refunds are processed within 5–7 business days after we receive the returned item. The refund will be issued to your original payment method.
Non-Returnable Items
Items that have been installed, used, or damaged after delivery are not eligible for return.
Warranty
Manufacturer's Warranty
All products sold at Home Crucial are covered by the manufacturer's warranty. Warranty terms vary by brand and product — please refer to the documentation included with your product for specific details.
What Is Covered
Manufacturer warranties typically cover defects in materials and workmanship under normal use and conditions. Coverage does not include damage caused by misuse, improper installation, or normal wear and tear.
Warranty Claims
To initiate a warranty claim, contact us at sales@homecrucial.com with your order number, a description of the issue, and photos if applicable. We will coordinate with the manufacturer on your behalf.
Extended Protection
Extended warranty and protection plans may be available for select products. Contact us for more details.
Customer Reviews
★★★★★ 4.9 out of 5 · 20 reviews
High-efficiency 5th Gen ENERGY STAR® rated DIY mini split heat pumps.
-
Outdoor esthetics do matter.
-
Create your bundle with ease.
-
Authorized Dealer of Mr Cool™.
