There are lots of ways for your Wallingford home to lose energy – through leaky door frames, cracks in window trim, loose or missing insulation, etc. A lot of your indoor heating and cooling winds up outdoors and drives up your utility bills.
One part of your home that is susceptible to leaks and energy loss is your ventilation system, typically metal or flexible ductwork. Older homes generally experience more duct leakage because seals and joints may have loosened over the years or may have not been properly connected when they were installed. There are some ways to check and see – or hear – if the air ducts in your home are leaking.
The most obvious way to check is by listening. Stand, sit, or kneel close to your ductwork. Listen for any hissing noises when the furnace, air conditioner, or blower motor is in operation. A hissing noise is usually an indication of a leak in a seal or joint. Since ductwork comes in a variety of lengths and contains a number of different connectors, there are likely many joints where pieces have been connected. Some joints are sealed with small sheet metal screws while other joints are sealed with duct tape or mastic. Whatever the connection is, the joints may have come loose over time from vibrations, settling of the home’s foundation, previous repairs, or by someone simply bumping into the ductwork.
Another way to check for a leaking air duct is by looking at insulation which may be wrapped around the ductwork. If an air duct is leaking it will leave dark stains on the insulation over time – giving an exact location of the leak.
Leaks in your air ducts can cause areas like your crawlspace, attic, or garage to be abnormally cold or hot. If you are conditioning unused parts of your home inadvertently, it may be because your ductwork is leaking in those areas.
Finally, a not so easy way to check for leaking ducts is to compare utility bills. If there is a big spike in your heating or cooling costs, it may be because of temperature extremes – but it also may be because your ductwork is leaking. You may not be able to see a big difference in your bills unless there are large leaks or breaks in your ductwork, but keep an eye on your energy costs anyway.