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Indoor air & ducts

Duct Repair and Air Duct Sealing

Duct repair and air duct sealing for Hillside, IL.

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SquareHVAC technician sealing a basement duct joint with mastic

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Choose your next step

What should you do next?

Not sure if you need service now or can wait? Use these signs to choose a practical next step. Talking through what your system is doing does not commit you to an appointment.

See smoke, flames or signs of a fire? Leave the building, stay out and call 911. If there is no fire and it is safe to use the controls, switch the system off and call SquareHVAC.

Emergency service is available 24/7, including Sundays.

Urgent

Call now

For smoke or flames, leave the building, stay out and call 911. Call us for water leaking from equipment, or if the system has stopped and the quick checks below did not help.

Call (708) 673-5633

Within a few days

Request service soon

Arrange a visit if some rooms have weak airflow, ductwork rattles, or you can see a loose duct joint.

Send a service request

No rush

Monitor and plan

If airflow is steady and there are no visible duct problems, keep an eye on dust and comfort. If airflow changes or you see a loose duct joint, request service.

Request duct service

Quick checks before you call

How to prevent duct problems

  • Do not store boxes on flexible ducts in the attic or the crawl space. A crushed duct carries little air.
  • After a remodel, plumbing work or electrical work, have the ducts checked. They are often moved or disconnected by accident.
  • Keep the vents and the return grilles open and uncovered.
  • Change the air filter on time. A blocked filter raises the pressure in the ducts and opens weak joints. The filter guide explains the choices.
  • Do not use cloth duct tape on a joint. It dries out and falls off.

Signs to call us about

Signs you need duct repair

  • Rooms that never get warm in winter or cool in summer, even when the system runs
  • Dusty vents or visible dust around registers
  • High energy bills despite working furnace and AC equipment
  • Whooshing, rattling or whistling from the ductwork
  • Air blowing into attics, crawl spaces or unconditioned areas

Your ductwork moves heated and cooled air from the equipment to the rooms. When it leaks, that air ends up in the attic, the crawl space or the walls instead. SquareHVAC is based in Hillside and serves communities within approximately 30 road miles. We inspect, repair and seal ductwork for homes.

Mastic sealant being brushed onto a joint in metal ductwork

The written quote

We explain what we found and what it costs, in writing, with parts and labor listed separately. You review it; you decide. Work only begins once you approve.

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Why duct repair matters

  • Energy. Leaky ducts send conditioned air into attics, crawl spaces and walls. Sealing the leaks means more of it reaches the living areas.
  • Comfort. Sealed ducts deliver balanced airflow to every room, instead of some rooms getting too much and others none.
  • Air quality. Gaps in return ducts can pull dust and pollutants from basements and attics into the air you breathe.
  • Equipment. A system that has to work harder to make up for leaky ducts wears out faster.

What happens during the visit

We provide a written quote for approval before work begins, with parts and labor listed separately.

  1. Step 1

    Inspection.

    We inspect the ducts and locate gaps, disconnections, crushed sections and joints that pass through unconditioned spaces.

  2. Step 2

    Sealing.

    Joints and seams are sealed with mastic sealant or metallic tape, including around boots, boxes and registers.

  3. Step 3

    Insulation where needed.

    Exposed ducts in attics, crawl spaces or garages are insulated so they stop losing heat in winter and gaining it in summer.

  4. Step 4

    Testing.

    After the work we check airflow at the vents and that the system runs without excessive cycling.

More services and guides

Common questions about duct repair

How much does duct repair cost?
The cost depends on how much of the ductwork needs sealing, how accessible it is and whether sections need replacing. We assess the system, explain what we found and provide a written quote for approval before work begins.
How long does a duct repair visit take?
It depends on how much of the ductwork needs sealing and how easy it is to reach. We tell you the expected time in the written quote, before you decide.
Do you also clean ducts?
Yes. Duct cleaning is a separate service. Cleaning and sealing solve different problems, and we tell you which one you need after the inspection.

Service area

Areas we serve

We serve Hillside and communities within approximately 30 road miles.

All service areas

Next step

Request duct repair

Tell us what is happening at your property. We will arrange a visit, explain what we find and give you a written quote with parts and labor listed separately. Nothing starts until you say go.

Request service Call (708) 673-5633