What Kind of Thermal Tape Should I Use to Wrap My MRCOOL Line Set?

If you’re installing or maintaining a MRCOOL HVAC system, especially a mini split or DIY® system, it’s important to protect your line set properly—both to ensure efficient performance and to extend the life of your installation. One key part of this process is wrapping the line set with the correct type of thermal insulation tape.

Do I Need to Wrap the Line Set?

Yes—if you're installing a MRCOOL system and run out of insulation tape, it's important to cover key areas of the line set to maintain efficiency and prevent damage. Focus on wrapping:

• Flare connections

• Line set extensions

• Any areas where the insulation was cut or removed during installation

• Sections exposed to direct sunlight or outdoor elements

Properly wrapping these spots helps protect against energy loss, condensation buildup, and weather-related wear.

Recommended Thermal Tape for MRCOOL Line Sets

When applying additional insulation, you should use thermal insulation tape specifically rated for HVAC use. Here’s what to look for:

✅ Recommended Tape Characteristics:

• Closed-cell foam or elastomeric rubber-based tape

• Self-adhesive and designed for outdoor weather exposure

• UV- and moisture-resistant

• At least 1/8" thick, with thicker options available for hotter climates

• Meets UL 181 or equivalent HVAC safety standards

🔧 Common Products That Work Well:

• Self-Seal Insulation Tape

• Rubber Foam Weatherseal Tape

• Closed Cell Insulation Tape

What NOT to Use:

Avoid using products not intended for HVAC systems, such as:

• Standard duct tape

• Thin craft foam tapes

• Non-UV-rated adhesive wraps

These materials break down quickly and can lead to energy loss, condensation, or even system damage over time.

Installation Tips:

• Clean the surface of the line set insulation before applying new tape

• Overlap each wrap by at least 50% to ensure full coverage

• Seal all exposed flare fittings and line extensions thoroughly

• Use a UV-resistant wrap or weather cover for exposed outdoor connections

Final Note

Properly wrapping and sealing your MRCOOL line set ensures energy efficiency, protects against weather damage, and helps maintain warranty compliance. If you’re unsure which product to use or have additional questions about your setup, feel free to contact MRCOOL Support—we’re here to help.