If the insulation in your house’s HVAC ductwork has seen better days, consider replacing or upgrading it to improve energy efficiency and reduce your utility bills.
This is particularly true if the ductwork is located in the attic, where the intense summer heat can make your air conditioner work overtime to cool your home.
When working with fiberglass insulation, always wear:
Gloves are a good idea, too, but it can be hard to do the delicate fitting and taping required while wearing them.
Repairing Leaks in HVAC Ductwork
Start by turning your heating/cooling system on and feeling along the ducts for air leaks. Pay particular attention to any joints or connections in the ductwork, and mark any air leaks you find. Then turn off the HVAC unit.
Cover any air leaks with metallic foil tape made for sealing ductwork. Don’t use standard cloth duct tape on HVAC ductwork, since the adhesive won’t hold up to extreme temperatures.
For an added layer of protection, you can apply duct mastic to the tape