How Leaky Ducts Affect Your HVAC System and Energy Bills

May 10, 2025

Leaky ducts are draining your comfort and cash—here’s how to fix them!

Close-up of a repaired metal duct joint with black sealant in an attic

Your HVAC system works behind the scenes, ensuring your home stays warm in winter, cool in summer, and filled with fresh air year-round. But what if there’s a hidden problem quietly making it work overtime, wasting energy and driving up your bills?


Leaky ductwork is a sneaky problem that often flies under the radar in home HVAC systems. Those tiny gaps and cracks in your air ducts can let your conditioned air slip away, leaving you with uneven room temperatures, stale air, and rising energy bills you didn’t see coming.


At Lakeshore Air Duct Cleaning, we’re here to help you uncover and repair those pesky duct leaks that can throw off your home's comfort and efficiency. Think your ducts might be leaking? Here’s what you should know!


How Do Duct Leaks Form?

Even in newer homes, ductwork can take a beating over time. Curious about the reasons behind leaks? These are some of the usual suspects:


Poor Installation 

If ducts aren’t sealed right during installation, air can start slipping out through loose or misaligned connections from the very beginning.


Aging and Decline

As the years go by, the ductwork in your home may begin to reveal signs of wear and tear. Seals wear thin, materials break down, and small cracks sneak in, letting air escape where it shouldn’t.


Damage from Pests 

Rodents and small critters can gnaw through ductwork or leave gaps behind as they crawl through, causing air to escape where it shouldn’t.


Faulty Sealing 

The adhesives and sealants used during installation aren’t built to last forever. Over time, they can wear out and create tiny gaps where air can slip through.


Signs Your Ducts Might Be Leaking

Leaky ductwork can be sneaky, but it often leaves clues: 


  • Do certain rooms in your home feel way hotter or colder than others? 
  • Have your energy bills mysteriously crept up? 
  • Is there more dust piling up than usual? 
  • Is your HVAC system struggling to maintain consistent temperatures and working harder than it should?
  • Ever hear a faint whistle or hiss near your air vents


If any of this sounds familiar, your ducts might be trying to tell you something—it’s time to give them some attention.


What Leaky Ducts Are Really Costing You

Most homeowners don’t realize how much leaky ducts can affect their homes—it’s not just about uneven temperatures.


Wasted Conditioned Air 

Did you know that up to 30% of the air in your HVAC system could be slipping away through leaks? You've already paid to heat or cool that air, yet it never even reaches your living space.


Increased Energy Costs

Air leaking through your ducts forces your system to work harder than it should, leading to increased energy costs and unnecessary power waste.


Overworking Your HVAC System

An HVAC system pushed to its limits won't stand the test of time. Leaky ducts make it work overtime, which puts extra stress on parts like the blower motor and compressor. Over time, this can mean costly repairs—or worse, a system that gives out before its time.


Poor Indoor Air Quality 

Leaky ducts aren’t just an energy drain—they can also bring in dust, allergens, and other harmful particles from places like crawl spaces, basements, or attics. These intruders spread throughout your home, contaminating the air you breathe and posing a risk to your family’s well-being.


Uneven Heating and Cooling 

Leaky ducts can throw off your home’s comfort, leaving some rooms feeling like a sauna while others stay uncomfortably cold. It’s frustrating to keep fiddling with the thermostat, trying to find a balance that works.


Increased Environmental Impact 

When your home wastes energy, your carbon footprint grows. Sealing up those leaky ducts doesn’t just make your home more efficient—it cuts down on wasted energy and helps the planet too.


Spotting and Fixing Those Pesky Leaky Ducts

Think you might have duct leaks? The first step is understanding the situation. Here's where to begin:


DIY Duct Inspection 

  • Spot the gaps and cracks – Take a walk through your attic, basement, or crawl spaces and check for any holes, cracks, or sections of ductwork that aren’t properly connected. 
  • Feel for leaks – Turn on your HVAC system and carefully run your hand along the ducts. If you feel air sneaking out, you’ve got a leak! 
  • Check for dusty clues – Notice a lot of dust piling up around vents or seams? That could mean air is slipping out through cracks in your system.


Expert Solutions 

While DIY inspections can catch some issues, professional repairs are the key to long-lasting, dependable fixes. 


  • Hands-On Sealing – Our HVAC pros use high-quality mastic sealants and tough tape to tackle leaks with precision. 
  • Aeroseal Technology – This innovative method sprays a fine mist of sealant inside your ducts, sealing leaks even in those tricky, hard-to-reach spots. 


At Lakeshore Air Duct Cleaning, we combine tried-and-true techniques with cutting-edge technology to ensure your ducts are sealed tight and running like a dream.


The Hidden Perks of Fixing Leaky Ducts

Sealing duct leaks isn’t just about saving energy—it’s about making your home a better place to live. 


  • Save on Energy Costs – When your ducts are sealed, your HVAC system doesn’t have to work overtime, which means lower utility bills and more money in your pocket. 
  • Enjoy Perfect Comfort All Year – No more battling uneven temperatures! Sealed ducts ensure consistent heating and cooling in every room of your home.
  • Breathe Cleaner Air – Properly sealed ducts keep out dust, allergens, and pollutants, so your family can enjoy fresher, healthier air. 
  • Boost the Lifespan of Your HVAC System – Reducing strain on your HVAC system leads to fewer breakdowns and helps it last longer over time.


A simple fix with lasting benefits—what’s not to love?


Don't Wait—Book Your Duct Inspection Today

Leaky ductwork might be silently driving up your energy bills and impacting your home's comfort. The best part? Fixing it is simpler than you’d expect!


Here at Lakeshore Air Duct Cleaning, we’re all about finding and fixing those pesky duct leaks so you can save money and breathe easier. From traditional sealing methods to innovative Aeroseal technology, we have the expertise to restore your system to peak performance.


Stop settling for high energy bills and inconsistent temperatures. Reach out to us today to schedule a duct inspection and start your journey toward a cozier, more energy-efficient home.

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