Unfortunately, many duct systems are poorly
insulated or not insulated properly.
Ducts that leak heated air into unheated spaces can add
hundreds of dollars a year to your heating and cooling bills.
Insulating ducts that are in unconditioned spaces is usually
very cost effective. If you are buying a new duct system,
consider one that comes with insulation already installed.
Sealing your ducts to prevent leaks is even more important
if the ducts are located in an unconditioned area such as
an attic or vented crawl space. If the supply ducts are leaking,
heated or cooled air can be forced out unsealed joints and
lost. In addition, unconditioned air can also be drawn into
return ducts through unsealed joints. In the summer, hot attic
air can be drawn in, increasing the load on the air conditioner.
In the winter, your furnace will have to work longer to keep
your house comfortable. Either way, your energy losses cost
A Few Basic Tips
- Check your ducts for air leaks. First look for sections
that should be joined but have separated and then look for
- If you use duct tape to repair and seal your ducts, look
for tape with the Underwriters Laboratories (UL) logo to
avoid tape that degrades, cracks, and loses its bond with
- Remember that insulating ducts in the basement will make
the basement colder. If both the ducts and the basement
walls are uninsulated, consider insulating both.
- If your basement has been converted to a living area,
install both supply and return registers in the basement
- Be sure a well-sealed vapor barrier exists on the outside
of the insulation on cooling ducts to prevent moisture buildup.
- Get one of our professionals to help you insulate and repair all ducts.