Your home’s duct system is one of the most important systems in your home, and may be wasting a lot of your energy dollars. It is a branching network of tubes in the walls, floors, and ceilings, carries the air from your home’s furnace and central air conditioner to each room.
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.
Although minor duct repairs are easy to accomplish, ducts in unconditioned spaces should be sealed and insulated by qualified professionals using the appropriate sealing materials. Here are a few simple tips to help with minor duct repairs.
Check your ducts for air leaks. First look for sections that should be joined but have separated and then look for obvious holes.
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 age.
Remember that insulating ducts in the basement will make the basement colder. If both the ducts and the basement walls are un-insulated, consider insulating the basement walls and the ducts.
If your basement has been converted to a living area, install both supply and return registers in the basement rooms.
Be sure a well sealed vapor barrier exists on the outside of the insulation on cooling ducts to prevent moisture build up.
Get a professional to help you insulate and repair all ducts.