MRCOOL DIY® E-Star 18K BTU 5th Gen Single-Zone Mini Split System

The MRCOOL DIY® E-Star 5th Generation 18,000 BTU Single-Zone Mini Split System is engineered for homeowners who need strong heating performance in colder climates without giving up the simplicity of DIY installation. Designed for spaces approximately 500–750 square feet, this system delivers dependable year-round comfort with enhanced cold-weather capability.

Unlike standard mini split systems, the E-Star series is cold-climate optimized, using advanced inverter and compressor technology to maintain heating performance at much lower outdoor temperatures. While all MRCOOL systems provide efficient cooling, the E-Star is purpose-built for regions that experience extended winter conditions.

Built on MRCOOL’s proven DIY platform, the system includes a 25 ft MRCOOL® DIY® Quick Connect Pre-Charged Line Set, allowing installation without vacuum pumps, refrigerant handling, or specialized HVAC tools. All critical components arrive factory sealed and pre-charged, making installation accessible for homeowners while maintaining professional-grade performance.

The E-Star system uses R-454B refrigerant, a lower-GWP alternative to R-410A that meets modern efficiency and environmental standards while supporting high-performance heating and cooling. Advanced inverter operation helps maintain consistent indoor temperatures while reducing energy consumption.

Comfort control is simple and flexible. The system supports wireless remote control, app-based control through the MRCOOL Smart HVAC app, and voice control via Amazon Alexa and Google Assistant. Features such as Follow Me temperature sensing and Dry Mode dehumidification allow precise comfort adjustments throughout the year.

Designed for durability, the outdoor condenser features Gold Fin® corrosion-resistant coating, making it suitable for coastal or harsh environments. Backed by manufacturer warranty coverage when properly registered, the MRCOOL DIY® E-Star 18K system offers long-term reliability and peace of mind.

This system is an ideal solution for homeowners seeking cold-climate heating performance, smart control, and the cost savings of DIY installation—without compromising quality or capability.

Specifications & Dimensions

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!