MRCOOL DIY® 5th Gen E Star 18,000 BTU Single Zone Mini Split Complete System with 25ft. Line Set 230V, DIY-18-HP-WM-230D25-O

MRCOOL® DIY® 5th Gen 18K BTU Single Zone Mini-Split Air Handler – Powerful, Energy-Efficient Comfort for Your Home

Upgrade your home’s heating and cooling system with the 5th Gen MRCOOL® DIY® 18K BTU Single Zone Mini-Split Air Handler, designed for effortless DIY installation and year-round climate control in spaces ranging from 500 to 750 sq. ft. Engineered for efficiency, this system features advanced inverter technology, eco-friendly R-454B refrigerant, and smart home integration, ensuring superior comfort without the need for professional installation.

Effortless DIY Installation – No HVAC Technician Needed

MRCOOL’s patented DIY® technology allows you to install your system quickly and easily—no special tools, vacuum pumps, or professional expertise required.

✔ DIY® QuickConnect® Line Set – Pre-charged with R-454B refrigerant, enabling a vacuum-free, tool-free installation.
✔ DIYPRO® Cable – Enhances safety and durability, eliminating the need for electrical conduit while providing superior protection against outdoor elements and wildlife.
✔ Step-by-Step Installation Guide & Video Support – Clear, user-friendly instructions to help you install with confidence.

💡 Perfect for homeowners and DIY enthusiasts looking for an affordable, professional-grade HVAC solution!

Eco-Friendly R-454B Refrigerant – Lower GWP, Higher Efficiency

The 5th Gen MRCOOL® DIY® Mini-Split is designed with R-454B refrigerant, an advanced, environmentally friendly alternative to R-410A.

✔ Lower Global Warming Potential (GWP) – Reduces environmental impact while maximizing efficiency.
✔ ENERGY STAR® Certified Performance – Saves energy and lowers utility bills.
✔ Smart Inverter Technology – Adjusts compressor speed for optimal energy savings and quiet operation.

Smart Home Integration – Climate Control at Your Fingertips

Enjoy the ultimate convenience with multiple ways to control your indoor comfort:

✔ SmartHVAC App – Adjust settings via your smartphone (iOS & Android) from anywhere.
✔ Voice Command Compatible – Works with Amazon Alexa & Google Assistant for hands-free control.
✔ Wireless Remote Control – Easily manage temperature, fan speed, and modes.
✔ Follow Me® Function – The remote acts as a personal thermostat, adjusting airflow based on its location.
✔ Dry Mode (Dehumidification) – Removes excess moisture to improve indoor air quality and reduce humidity.

Durability & Long-Lasting Performance

Built to withstand harsh weather conditions, the MRCOOL DIY® Mini-Split is designed for years of reliable performance.

✔ Gold Fin® Condenser – Corrosion-resistant coating protects against salt air, rust, and extreme weather, making it ideal for coastal homes.
✔ Intertek Certified (5031495) – Rigorously tested to meet industry-leading safety and performance standards.
✔ Ultra-Quiet Operation – Experience whisper-quiet heating and cooling, perfect for bedrooms, offices, and living spaces.

Industry-Leading Warranty – Confidence in Every Purchase

MRCOOL backs the 5th Gen DIY® Mini-Split with an unmatched industry warranty, giving you total peace of mind:

✔ Limited Lifetime Warranty on the Compressor
✔ 7-Year Compressor Warranty
✔ 5-Year Parts Warranty

Why Buy from MRCOOL DIY Direct?

As the USA’s most trusted independent MRCOOL dealer, we provide:

✅ Factory-Direct Pricing – Get the best deals on genuine MRCOOL systems.
✅ Fast & Reliable Shipping – Quick delivery across the lower 48 states.
✅ Expert DIY Support – Need help? Our team is here to assist with installation and troubleshooting.

Upgrade to the MRCOOL® DIY® 5th Gen 18K BTU Mini-Split Today!

Enjoy powerful, energy-efficient climate control year-round—all with a true DIY-friendly installation. Order now and experience the easiest way to heat and cool your space! 🚀

At MRCOOL DIY Direct, we understand that every home is different, and that the standard 25-foot pre-charged line set included with MRCOOL DIY systems may not fit every installation. That’s why we offer a range of longer and customizable line set options, making it easier for you to get exactly what you need — without extra hassle or unnecessary parts.

🚀 How Our Line Set Options Work:

• Standard System:
  Every system from MRCOOL comes factory-bundled with a 25' pre-charged line set and 25' of control wire.

• Choosing an Alternate Length:
  If you select a different line set length (such as 16', 35', 41', 50', or 75'):

  • Your order will be custom-bundled individually at our warehouse.

  • This process typically adds 1–2 extra business days for preparation and shipping.

  • You will receive the exact pre-charged line set footage you requested — either as a single line set or a combination of two line sets (if needed) to achieve the proper length.

📦 Important Details to Know:

• Single vs Combined Lengths:

  • 16': Factory 25' is swapped for a 16' pre-charged line set.

  • 35': A single 35' pre-charged line set is provided.

  • 41': Combines your standard 25' line set with an additional 16' line set + supplied coupler + extended control wire.

  • 50': A continuous 50' pre-charged line set is provided with longer control wire.

  • 75': Combines a 25' + 50' pre-charged line set with couplers and 75' of extended control wire.

• Control Wire Upgrade:
  Any time your line set length exceeds 25', you will receive a new longer control wire matched to the total length.

  We never recommend splicing control wires. These systems are essentially computers — shielded, continuous control cable ensures no interference, no corrosion, and no installation headaches down the road.

🛒 Why Shoppers Trust MRCOOL DIY Direct:

Unlike big-box retailers that sell you a one-size-fits-all kit (and leave you hunting for missing parts), we custom-configure your system so you have everything you need from the start.

• No extra trips to the hardware store.

• No guessing which coupler or cable you need.

• No surprises during installation.

With years of experience specializing in DIY HVAC systems, MRCOOL DIY Direct has earned a reputation as the USA's most trusted independent HVAC dealer.
We are committed to making DIY HVAC installation simple, affordable, and frustration-free — and our custom line set bundling is just one more way we deliver on that promise.

🔧 Need help choosing the right line set length for your project?
Contact our expert team today — we’re here to help you get it done right the first time!