What is duct sealing and why do I need it?

“Typical duct systems lose 25 to 40 percent of the heating or cooling energy put out by the central furnace, heat pump or air conditioner. Duct repairs could be the most important energy improvement measure you can do.” 

U.S Department of Energy

Without Duct Sealing...

20% to 40% Air Leakage

3 out of 4 homes experience unintended air entering into and out of the ductwork.

Lost Conditioned Air

Duct leakage results in air not getting to the intended locations in your home, resulting in higher energy bills, reduced airflow, and comfort issues.

Poor Air Quality

Untreated and unaltered air from crawlspaces, attics, wall cavities, and other spaces can be pulled into ductwork and enter the home airstream.

Overworked HVAC

Your system is forced to work harder trying to get air where it is designed to go.


With Duct Sealing...

Up to 30% Energy Savings

Reduce duct leakage by up to 95% and your energy bills by up to 30%.

Increased Comfort

Reduce temperature differences between doors and hard to heat or cool rooms for additional comfort throughout the home.

Improved Air Quality

Reduce dust, allergens, and pollutants entering the airstream and in your living areas.

Extend Your HVAC Equipment Life

Extend the life of the most expensive system in your home by reducing the effort your HVAC equipment needs to meet your comfort needs.

High utility bills? Stuffy rooms? Dusty house?
It could be your ducts.

A duct system that is properly sealed and insulated can make your home more comfortable, energy efficient, and safer. Making improvements to your duct system can:

Save Money

Leaky ducts can reduce heating and cooling system efficiency by as much as 20%. 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.

Enhance 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.

Improve Comfort

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.

Promote Safety

During normal operation, gas appliances such as water heaters, clothes dryers, and furnaces release combustion gases (like carbon monoxide) through their venting 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 reduce this risk.

Lower your utility bills + improve your health and comfort!

Many home efficiency and comfort problems don’t stem from your furnace or air conditioner but rather the ductwork that delivers conditioned air to your home.

Leaks pull pollutants into the air we breathe. Nearly 50% of your energy bill is spent on heating and air conditioning and 30 cents for every dollar is lost due to leaking ducts. With a 10 year money back guarantee, Aeroseal can recapture lost air, improve indoor air quality, allow your machine to work as intended and heat or cool your home evenly. The sealing process can reach impossible to reach areas to give air tight comfort and savings!

  • Reduce energy usage and high energy bills
  • Fix uncomfortably hot or cold rooms
  • Prevent 85% of dust and allergens from entering (or re-entering) your home
  • Reduce humidity
  • Reduce the need to clean your ductwork

Signs that your home may have leaky ducts

In houses with forced-air heating and cooling systems, ducts are used to distribute conditioned air throughout the house. But in typical houses, about 20% of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts. The result is higher utility bills and difficulty keeping the house comfortable, no matter how the thermostat is set.

Some signs that your home may have leaky, poorly insulated, or inefficient 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, unfinished basement, crawlspace, or the garage.
  • You find tangled or kinked flexible ducts in your system.

Common duct problems and solutions



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 ducts with improved airflow


For more information about sealing your ducts, call Arrowseal today:


Northern Arizona