MRCOOL DIY® 5th Gen E Star 12,000 BTU Single Zone Mini Split Complete System with 25ft. Line Set 115V, DIY-12-HP-WM-115D25-0

MRCOOL DIY® 5th Gen ENERGY STAR® 12K BTU Single Zone Mini Split – The Ultimate DIY HVAC Solution

Take total control of your home’s heating and cooling with the MRCOOL DIY® 5th Gen ENERGY STAR® 12,000 BTU Single Zone Mini-Split System. Engineered for easy, tool-free installation, this high-efficiency ductless heat pump is the perfect climate solution for rooms up to 550 sq. ft. Featuring eco-friendly R-454B refrigerant, advanced inverter technology, and smart home integration, this system delivers powerful heating and cooling performance while reducing energy consumption and lowering utility costs.

Revolutionary DIY Installation – No HVAC Technician Needed

Say goodbye to expensive HVAC installation costs! The MRCOOL DIY® Mini Split features a patented QuickConnect® pre-charged line set, allowing homeowners to install the system themselves without special tools, vacuum pumps, or professional assistance.

• DIYPRO® Cable – Provides enhanced safety, durability, and eliminates the need for electrical conduit.
• No Vacuuming Required – Pre-charged refrigerant lines ensure a hassle-free setup.
• Step-by-Step Installation Guide & Video Support – Everything you need to install with confidence.

Superior Energy Efficiency & Eco-Friendly R-454B Refrigerant

The MRCOOL DIY® 12K BTU mini split is ENERGY STAR® certified, ensuring maximum efficiency and cost savings. It utilizes R-454B refrigerant, which has a significantly lower Global Warming Potential (GWP) than R-410A, making it an environmentally responsible choice for homeowners looking to reduce their carbon footprint.

Smart Home Integration – Total Climate Control at Your Fingertips

Experience ultimate convenience with multiple control options that let you adjust your indoor climate anytime, anywhere:

✔ Wireless Remote Control – Adjust temperature, fan speed, and modes with ease.
✔ SmartHVAC App (iOS & Android) – Control your system remotely via smartphone.
✔ Amazon Alexa & Google Assistant Compatible – Enjoy voice-activated climate control.
✔ Follow Me® Function – Sensors in the remote detect your location to maintain consistent comfort.
✔ Dry Mode Dehumidification – Removes excess moisture for improved indoor air quality.

Built for Durability & All-Season Performance

Designed to withstand extreme weather conditions, the MRCOOL DIY® Mini Split features a Gold Fin® Condenser that provides superior corrosion resistance—ideal for coastal climates and long-term durability.

• Reliable Heating & Cooling – Works efficiently in both hot summers and cold winters.
• Quiet Operation – Ultra-low noise levels ensure uninterrupted comfort.
• Intertek Certified (5031495) – Rigorously tested for safety, efficiency, and performance.

Industry-Leading Warranty for Peace of Mind

MRCOOL backs the 5th Gen DIY® Mini Split with an industry-best warranty, ensuring long-term reliability:

✔ 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 MRCOOL dealer, we provide:

✅ Factory-Direct Pricing – Get the best deals on MRCOOL HVAC systems.
✅ Fast, Secure USA Shipping – Get your mini split quickly and safely delivered.
✅ Expert DIY Support – Our team helps you every step of the way.

Upgrade to the MRCOOL DIY® 5th Gen 12K BTU Mini-Split – The Easiest & Most Efficient Way to Heat & Cool Your Space Year-Round!

Order now and enjoy powerful, energy-efficient climate control with a system designed for easy installation and long-lasting performance.

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!