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How to Stop Condensation on Air Ducts: Best Practices

Eric Bullard • 10 January 2023
Air Duct Cleaning in Tucson, AZ

Ductwork condensation, or sweating, is a common problem many homeowners face. While it may seem minor, if left unattended, the water on and in ductwork can cause structural damage and other complications that are significantly more expensive and time-consuming to repair. 


Understanding the causes and consequences of air duct sweating is essential to knowing how to stop condensation on air ducts. If you suspect your air ducts need some TLC, give Steam Smart Pro a call to schedule air duct cleaning in Tucson and keep your home feeling fresh and clean.


Causes of Air Duct Condensation


Your HVAC ductwork transfers air from the AC vent to the cooling unit and back. Ductwork comes in various materials, including sheet metal, fiberglass, flexible plastic tubing, or even fiberboard, and some of these materials are more likely to generate condensation than others. 


Natural Condensation


Condensation results from a temperature difference between the air and a solid surface. Cold air can hold fewer water vapor molecules than warm air, so any air that comes into contact with a cold surface will lose some of its water vapor in the form of condensation.


The larger the difference in temperature between the surface and air, the more condensation you get. Similarly, the warmer the ambient air, the more water it can hold and the more condensation you’ll get when it hits a cold surface.


HVAC ductwork carries cooled air throughout your home, and some ductwork materials will cool down as they transport this air. The result is condensation due to the temperature difference between the warm air and the cooled ductwork. While some sweating is normal, especially during hotter and more humid days, excessive sweating may indicate other issues. 


HVAC Unit Issues


A faulty HVAC unit will struggle to circulate air throughout the system, which leads to water droplets in and around the ductwork. Other signs of a faulty unit include strange noises and rattles or poor cooling, which, combined with condensation, is a sure sign that your cooling unit needs professional attention.


Poor Insulation


Poorly insulated ducts are more prone to condensation, as they become colder more easily than insulated materials. An added insulation layer can reduce condensation by keeping the cold duct away from warm air. However, some older insulations are water-absorbent, which can worsen the problem and create even more condensation. 


Excessive Humidity


A high indoor humidity results in more condensation. In extreme examples, you may even see the walls in your home sweat as moisture collects on every surface. Maintaining a humidity level of approximately 40% to 60% will ensure comfort and reduce air duct condensation.


Hot Attic


Many attics are uninsulated and can get extremely hot during summer. In some cases, attics can get 20 degrees hotter than the ambient outdoor temperature, which is a problem if you have a lot of ductwork in your attic space. A good way to solve this problem while reducing your cooling bill is to insulate your attic to maintain a steady temperature. 


Adverse Effects of Air Duct Condensation


Most HVAC systems can handle a little bit of sweating, but excessive condensation can lead to many problems that affect more than just your heating and cooling. 


Damages Insulation


Water will collect in the insulation if you have insulated ductwork, reducing its insulating capacity. Condensation may also drip from ductwork onto your ceiling insulation, making it heavier and less effective. Damaged insulation increases your energy bill, and the extra water weight may cause your ceiling to collapse. 


Raises Indoor Humidity


High condensation and hot temperatures will eventually force the water droplets back into the air, raising overall humidity levels in your home. High humidity levels can impact your comfort and may lead to furniture warping, wallpaper peeling, and many other issues.


Promotes Mildew and Mold Growth


Mold spores are everywhere and just need a bit of moisture and heat to grow. Excessive condensation and high humidity can lead to mold growth in the ductwork and other areas of the home. Mold growth looks ugly, smells terrible, and may pose a health risk.


May Damage Structural Elements


Prolonged water exposure can be devastating to a home’s structural integrity. Water causes wood to rot, and since most American homes have wooden frames, this rot can lead to compromised structural integrity and potential collapse. 


How to Stop Condensation on Air Ducts


Stopping condensation may sometimes require addressing issues with your HVAC system, but in many cases controlling your home’s environment is sufficient to keep it under control. Depending on your circumstances, our technicians may recommend one of several methods of how to stop condensation on air ducts.

 

Reduce the Humidity


High humidity levels are the primary culprit of air duct sweating, and keeping humidity at optimal levels can keep condensation under control. If you often experience high humidity, consider investing in a dehumidifier and automated AC controller that can manage your humidity levels for you.


Add Duct Insulation


If you have older metal ducts, duct insulation can prevent the cold metal from coming into contact with warm air. Duct insulation can also stabilize your AC system and reduce your cooling bill.


Conduct Regular Ductwork Maintenance


Duct leaks, clogs, and worn insulation can all contribute to excess moisture in your ductwork. Regular maintenance is essential for keeping your system running optimally and can prevent issues such as duct condensation. 


While flexible ducts contain an insulation layer, this may wear down over time. Periodic maintenance checks will identify any potential issues before they start causing problems. 


Upgrade Your Attic


If you have an older home, chances are your attic doesn’t have proper insulation. Arizona summers are already very hot, and attics can reach temperatures outside the operating range for some ducts. Attic vents and insulation can help keep temperatures down, preventing condensation and making your entire HVAC system more efficient. 


Steam Smart Pro is here to help you with all your duct work needs. Whether you want to know how to stop condensation on air ducts or how often to clean air ducts, our experts are standing by to help. Call us at (520) 397-3770 and schedule an appointment today!


Author Bio:

Eric Bullard

The owner of Steam Smart Pro in Tucson, AZ, brings over 20 years of invaluable experience in the field of carpet, tile, and air duct cleaning. With a strong dedication to quality and a deep understanding of effective cleaning techniques, Eric consistently delivers outstanding results to his satisfied residential and commercial clients.

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