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What Causes Moisture to Build Up Around HVAC Vents?

Mark J. Biel • September 8, 2022

Seeing water stains or damp spots on your ceiling could be concerning. Sometimes these marks form not because of your roof but due to issues with HVAC vents. If this is the case, you must take action immediately to keep your equipment in good shape and prevent extensive water damage.

What Causes Moisture to Build Up Around HVAC Vents?

A local HVAC and  plumbing repair  expert explains what causes moisture to build up around vents. 

Air Leaks in Vents

Air leaks will occur in the duct boot when not sealed properly. As a result, cold air will come in contact with humid air, forming condensation and moisture. An HVAC professional can confirm if you are dealing with this issue after a thorough inspection. 

If your technician finds that the seams and connections in your ductwork aren’t sealed, address them immediately. Eliminating air leaks in the vents will help improve the performance of your equipment and reduce your energy costs. It can even help delay the need for a  new air conditioning  and heating system. 

Poor Insulation

A buildup of warm, humid air in your attic can cause condensation on the cold air ducts. When not addressed, moisture will eventually appear around vents. Adding ducts or insulation might be necessary to keep the issue from recurring. Professionals can help determine the best route for your home and equipment. 

Cold Supply Vents

HVAC vents could still develop moisture even if there is nothing wrong with your indoor humidity. Low refrigerant levels and poor airflow are common causes of this issue. You’ll need to have an HVAC technician check your unit’s refrigerant levels. Some things you can do to improve airflow include regularly replacing air filters and avoiding placing furniture or decor in front of vents.

Let R.A. Biel Plumbing and Heating handle your home’s HVAC needs. We specialize in  new heating system installation , HVAC repairs, air duct cleaning, and more! Call us at (505) 327-7755 or fill out our  contact form  to schedule a service.

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