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How to Seal Leaky Air Ducts From Inside the House

how to seal leaky air ducts from inside the house

Have you noticed that your home isn’t as comfortable as it should be? The problem might be hiding in your air ducts; even small leaks can let the conditioned air escape. The good news is that this is probably something you can fix yourself, and it’s easier than you might think—even if you have to seal air ducts from inside the house.

Even if your indoor climate seems fine, but you’ve seen the energy bill creep up for no clear reason, you can learn to improve your HVAC efficiency and start saving on energy costs. With just a little effort, let’s transform the way you handle duct upkeep.

Why It’s Important to Fix Duct Leaks

Air duct leaks can significantly impact your home’s overall efficiency.

When conditioned air escapes through leaks, your HVAC system has to work overtime to maintain the desired temperature, leading to higher energy bills and unnecessary wear on your system. Moreover, these leaks can allow dust, allergens, and other contaminants to enter your ducts, which can reduce indoor air quality and affect your family’s health.

Sealing these leaks is a simple yet effective way to enhance your home’s comfort and keep your energy costs in check.

What You’ll Need

Before you get started, gather the right tools and materials. Here’s what you’ll need:

  • Mastic Sealant or Metal Tape: These are the most effective materials for sealing air ducts. Mastic is a thick, paste-like sealant that’s great for joints and seams, while metal tape is excellent for wrapping around gaps and holes.
  • Cleaning Supplies: You’ll want to clean the area around the leak before sealing it, so have a cloth and some mild cleaning solution on hand.
  • Screwdriver or Wrench: To access certain parts of the ductwork, you might need to remove or loosen screws and panels.
  • Work Gloves: Protect your hands while working with the sealant or tape.
to seal a leaky air duct from inside, find the leak, clean the area, seal it carefully, and test the fix afterward.

Finding and Seal ASAP

Identifying where the leaks are is the first step. Start by visually inspecting the ductwork in accessible areas like your basement, attic, or crawl spaces. Look for any gaps, holes, or disconnected joints. If you’re having trouble spotting leaks, turn on your HVAC system and feel along the ducts for escaping air. Another trick is to use a smoke pencil or incense stick; hold it near the suspected areas, and watch for any movement in the smoke that indicates air leakage.

Step by Step Sealing

Once you’ve located the leaks, it’s time to fix them up:

1) Clean the Area: Start by cleaning the area around the leak to ensure the sealant or tape adheres properly. Wipe away any dust or debris with a cloth and a mild cleaning solution.

2) Apply the Sealant or Tape: If you’re using mastic sealant, spread a generous amount over the leak, making sure to cover it completely. Use a brush or your fingers (with gloves) to smooth it out. For metal tape, cut a piece that’s large enough to cover the gap, then press it firmly over the leak.

3) Check Your Work: Once you’ve applied the sealant or tape, give it some time to set. Afterward, check the area to make sure the leak is fully sealed. Turn your HVAC system back on and feel around the sealed spots to ensure no air is escaping.

Professional assessing residential air ducts to check for leaks inside the home
Professional assessing residential air ducts to check for leaks

Other Maintenance Tips

Sealing your ducts is just one part of maintaining a well-functioning HVAC system. Here are a few other tips to keep your system running smoothly:

  • Change Your Air Filters Regularly: Dirty filters can block airflow, forcing your system to work harder. Check and replace them every month or as recommended.
  • Keep Vents and Registers Clean: Dust and debris can accumulate, reducing efficiency. Regularly vacuum these areas to keep air moving freely.
  • Assess Your Ductwork Periodically: Even after sealing, it’s wise to check your ducts now and then for new leaks or signs of wear.

When to Bring in Professionals

For leaks in hard-to-reach places or if you suspect extensive damage, it’s wise to call in a professional. Experts can identify leaks that might have been missed and ensure that your entire system is operating efficiently.

If you’re still dealing with uneven temperatures, persistently high energy bills, or poor air quality after your efforts, a professional inspection can provide the solutions you need.

Wrapping It Up

So, there you have it–now, you can seal those leaky air ducts inside or outside the house. Tackling these leaks yourself is a great way to keep your HVAC system running smoothly, but remember that some situations might require professional help.

If you want to ensure your system is in top shape, consider scheduling an inspection with Waypoint Property Inspection. In Tampa, St. Petersburg, Lakeland, Orlando, Palm Beach, Ft. Lauderdale, and surrounding areas, our team of experts can help you identify problems throughout the house.