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 (Copy)

MRCOOL DIY® 5th Gen 12K BTU ENERGY STAR® Single Zone Mini Split Heat Pump

The MRCOOL DIY® 5th Gen 12,000 BTU Single Zone Mini Split is a high-efficiency ductless heat pump designed for homeowners who want powerful heating and cooling without the cost of professional installation. Built for rooms up to 550 sq. ft., this system combines DIY-friendly installation, ENERGY STAR® efficiency, and eco-friendly R-454B refrigerant to deliver year-round comfort with lower energy costs.

Using MRCOOL’s patented QuickConnect® pre-charged line set, this system installs without vacuum pumps, special tools, or HVAC certification. If you’re comfortable using basic tools, you can install it yourself.

DIY Installation Made Simple

• QuickConnect® Pre-Charged Line Set – No vacuuming or refrigerant handling required
• DIYPRO® Cable Included – Durable, shielded control cable with no conduit required
• Step-by-Step Instructions & Video Support – Install with confidence

Efficient, Eco-Friendly Performance

• ENERGY STAR® Certified for lower operating costs
• R-454B Refrigerant with reduced Global Warming Potential
• Advanced Inverter Technology for consistent comfort and energy savings

Smart Control Options

• Wireless remote control
• SmartHVAC app (iOS & Android)
• Amazon Alexa & Google Assistant compatibility
• Follow Me® temperature sensing
• Dry mode for improved humidity control

Built for Reliability

• Gold Fin® condenser coating for corrosion resistance
• Quiet operation for bedrooms and living spaces
• Intertek certified for safety and performance

Warranty Coverage

• Limited Lifetime Compressor Warranty
• 7-Year Compressor Warranty
• 5-Year Parts Warranty

Line Set Options (Important to Know)

Every MRCOOL DIY 5th Gen system includes a 25’ pre-charged line set and control wire. If your installation requires a different length, we custom-bundle your order so you receive the correct pre-charged line set and matching control wire, ready to install.

Longer or alternate line set selections may add 1–2 business days to order preparation so we can configure everything correctly.

We do not recommend splicing control wires. Continuous, factory-length cable ensures reliable communication and long-term system performance.