How Do You Insulate HVAC Ductwork?

How HVAC Ductwork Is Properly Insulated

Insulating HVAC ductwork is a multi-step process that improves efficiency and helps your system deliver air at the right temperature.

The first step is always sealing the ducts. Insulation alone won’t be effective if air is leaking out of the system.

Here’s how the process typically works:

• Inspect the duct system for leaks, gaps, or disconnected sections
• Seal any leaks using mastic, tape, or advanced methods like Aeroseal
• Wrap ducts with insulation, such as fiberglass duct wrap
• Secure insulation with proper fasteners and vapor barriers
• Ensure all joints and seams are fully covered and protected

In some cases, pre-insulated duct materials may be used, especially during new installations or major upgrades.

Insulating ductwork is especially important in unconditioned spaces like attics, where extreme temperatures can quickly affect airflow and system performance.

For homes in Fredericksburg, Kerrville, and across the Texas Hill Country, proper duct insulation can make a noticeable difference in comfort, efficiency, and energy costs.

72 Degrees Texas can evaluate your duct system and handle both sealing and insulation to ensure your HVAC system performs as efficiently as possible.