Weatherization – Duct Sealing
In houses with forced-air heating and cooling systems, ducts are used to distribute conditioned air throughout the house.
In a typical house, however, about 30% of the air that moves through the duct system is lost due to leaks, holes, and poorly connected joints. The result is higher utility bills and difficulty keeping the house comfortable, no matter how the thermostat is set.
How Do You Know If Your Home Has Poorly Performing Ducts?
- You have high summer and winter utility bills
- You have rooms that are difficult to heat and cool
- You have stuffy rooms that never seem to feel comfortable
- Your ducts are located in an attic, crawlspace, or the garage
- You find tangled or kinked flexible ducts in your system
Heating ducts sealed with mastic.
The Benefits of Duct Sealing
Sealing and insulating ducts can help with common comfort problems, such as rooms that are too hot in the summer or too cold in the winter.
Indoor Air Quality
Fumes from household and garden chemicals, insulation particles, and dust can enter your duct system, aggravating asthma and allergy problems. Sealing ducts can help improve indoor air quality by reducing the risk of pollutants entering ducts and circulating through your home.
During normal operation, gas appliances such as water heaters, clothes dryers, and furnaces release combustion gases (like carbon monoxide) through their ventilation systems. Leaky ductwork in your heating and cooling system may cause “backdrafting,” where these gases are drawn back into the living space, rather than expelled to the outdoors. Sealing leaks can minimize this risk.
Leaky ducts can reduce heating and cooling system efficiency by as much as 30%. Sealing and insulating ducts increases efficiency, lowers your energy bills, and can often pay for itself in energy savings. Plus, if you’re planning to install new heating and cooling equipment, a well-designed and sealed duct system may allow you to downsize to a smaller, less costly heating and cooling system that will provide better dehumidification.
Protect the Environment
The less energy we use in our homes, the less air pollution we generate. By sealing your ducts and reducing the amount of energy necessary to comfortably heat or cool your home, you can reduce the amount of air pollution generated.
Common Duct Problems
A. Leaky, torn, and disconnected ducts
B. Poorly sealed registers and grills
C. Leaks at furnace and filter slot
D. Kinks in flexible ductwork restricting airflow
E. Properly sealed ducts
F. Registers and grills tightly sealed to ducts
G. Sealed furnace and filter slot
H. Well-insulated ducts in unfinished areas
I. Straightened flexible ductwork