MRCOOL 5th Gen 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor

MRCOOL 5th Gen 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor

The MRCOOL DIY® 5th Gen 25 ft Pre-Charged Quick Connect Line Set (1/4″ x 1/2″) is a purpose-built refrigerant connection solution designed to simplify mini-split HVAC installation. This 25-foot line set arrives factory pre-charged with R-454B refrigerant, eliminating the need for vacuuming or on-site refrigerant charging. With MRCOOL’s Quick Connect® fittings, secure and leak-resistant connections can be made without specialized HVAC tools, making this line set ideal for both DIY installers and professionals looking for a straightforward installation process.

Engineered with a 1/4″ liquid line and a 1/2″ suction line, this line set is compatible with 9K, 12K, and 18K BTU MRCOOL DIY 5th Gen indoor air handlers, ensuring proper refrigerant flow and system performance when paired with these unit capacities. The compact 25-ft length is suitable for short-distance installations, such as close wall placements or nearby condenser setups, where excess line slack is not desired.

Constructed with durable materials and weather-resistant insulation, this line set is made to withstand outdoor exposure while protecting the internal refrigerant lines. Its design helps ensure efficient, year-round operation even when exposed to the elements, contributing to consistent performance over time.

Whether you’re upgrading an existing line set or installing a new MRCOOL DIY mini-split system, this 25 ft pre-charged Quick Connect line set offers a reliable, user-friendly solution that combines convenience, compatibility, and long-lasting performance.

Please note: This line set is compatible only with MRCOOL DIY models and is designed for easy DIY installation—no HVAC tools or certifications required.

Features

• Quick Connect Fittings
  No need for vacuuming or refrigerant charging. The fittings are leak-proof and make setup simple and tool-free.
• Pre-Charged with R-454B Refrigerant
  The line set comes fully charged with environmentally friendlier R-454B refrigerant, ready for use with compatible systems.
• 25-Foot Length
  Ideal for accommodating various installation distances, offering flexibility for wall-mounted indoor units.
• 1/4" x 1/2" Diameter Tubing
  Sized to fit 9K, 12K, and 18K BTU indoor units, ensuring maximum efficiency and compatibility.

Specifications

Applications

• Bedrooms – Quiet and efficient climate control for restful sleep.

• Living rooms – Comfortably heats or cools high-traffic areas.

• Home offices – Maintains a consistent temperature for productive work.

• Garages or Workshops – Great for retrofitting spaces without existing HVAC.

• Studio Apartments – Ideal for smaller open floor plans.

What’s Included

• 25 ft. pre-charged line set (1/4" x 1/2")

• User Manual

Warranty

• 5-Year Parts Warranty when registered and used with a DIY system
  

Frequently-Asked Questions

Is this line set compatible with earlier MRCOOL models?
No. This specific 5th Gen line set is only compatible with MRCOOL 5th Gen DIY systems using R-454B refrigerant.

Do I need HVAC tools to install this line set?
No. The Quick Connect fittings are designed for easy DIY installation without the need for HVAC tools or certification.

What systems is this line set intended for?
This line set works with MRCOOL DIY 9K, 12K, and 18K BTU indoor units from the 5th Generation series.