MRCOOL DIY 5th Gen 25 Ft. Pre-Charged Quick Connect Line Set, 3/8" x 5/8", for DIY 24K & 36K Indoor Mini Split Air Handler

MRCOOL DIY 5th Gen 25 Ft. Pre-Charged Quick Connect Line Set, 3/8" x 5/8", for DIY 24K & 36K Indoor Mini Split Air Handler

The MRCOOL DIY® 5th Gen 25 ft Pre-Charged Quick Connect Line Set (3/8″ x 5/8″) is a dependable refrigerant connection solution designed for use with MRCOOL 24K and 36K BTU indoor mini split air handlers. This line set comes factory pre-charged with eco-friendly R-454B refrigerant, allowing you to connect the indoor and outdoor units without the need for vacuuming or additional charging. It provides a simplified installation process while ensuring reliable system performance.

Built with MRCOOL’s patented Quick Connect fittings, the line set can be installed without specialized HVAC tools. Its 3/8″ liquid line and 5/8″ suction line are specifically sized to support the refrigerant flow requirements of the compatible 24K and 36K indoor units, helping maintain proper efficiency and smooth operation.

The 25-foot length offers flexibility for short-to-moderate installation distances, making it suitable for standard exterior wall placements and similar layouts. Its durable and weather-resistant outer jacket is designed to withstand outdoor exposure, ensuring long-lasting protection and dependable performance.

Ideal for homeowners and DIY installers working with MRCOOL 5th Gen mini split systems, this pre-charged line set provides an efficient, clean, and hassle-free refrigerant connection solution without compromising quality or durability.

Features

• Pre-Charged with R-454B – Comes prefilled and sealed with R-454B refrigerant, ensuring efficiency and reducing install time.
• Quick Connect Technology – Uses MRCOOL’s proprietary tool-free fittings for secure, no-vacuum, leak-resistant connections.
• Built for Larger Units – Designed for use with 24K and 36K 5th Gen MRCOOL indoor air handlers, delivering the proper refrigerant flow and performance.
• 25 Ft. Line Set Length – Perfect for installs with moderate distance between air handler and condenser, such as along exterior walls or mid-sized rooms.
• Heavy-Duty Construction – Insulated and protected with a UV- and weather-resistant jacket for long-term durability in all climates.
• No Special Tools Needed – Ideal for homeowners or installers looking for a simple, clean, and efficient installation solution.

Specifications

Applications

• Short-to-moderate installs – Ideal when the distance between indoor and outdoor units is around 25 feet

• Garage or workshop systems – Suitable for connecting to larger units in enclosed secondary structures

• First-floor installations – Works well for horizontally aligned indoor/outdoor units in larger rooms

• Mini split system upgrades – Perfect for replacing damaged or aged line sets with a factory-charged option

• Accessory for 24K & 36K air handlers – Built to support the capacity and dimensions of larger MRCOOL DIY systems

What’s Included

• 25 Ft. Line Set (3/8" x 5/8")

• Pre-installed Quick Connect fittings
  

Frequently-Asked Questions

Is this compatible with smaller MRCOOL units like 12K or 9K?
No. This line set is designed specifically for 24K and 36K 5th Gen MRCOOL DIY air handlers, which require 3/8" x 5/8" line sizes for correct operation.

Does it come with refrigerant already inside?
Yes. It is factory pre-charged with R-454B refrigerant, sealed and ready for use out of the box with compatible units.

Can I shorten or cut this line set to fit a tighter space?
No. This line set must be used at full length as designed. Altering it would compromise the refrigerant seal and system performance.

Do I need an HVAC professional to install it?
While it is DIY-friendly, users unfamiliar with HVAC work are encouraged to seek help from a professional for proper and safe installation.