Condensation on Air Vents

Do you see condensation coming from your air vents as if it’s sweating? Worse, is there leaking water? You’d be correct in assuming there may be a problem because if condensation is not addressed quickly, you can find yourself with major repair bills or dealing with property damage. 

Water on air vents could be typical condensation, but it could also be water leaking from the air conditioning and traveling through ductwork.

Where does condensation come from?

You already may be aware that condensation forms when hot/humid air comes in contact with a cold surface – much like a beverage on a hot day; the same goes for air conditioning in your home. 

This may be one case, but if your home is uncomfortably warm, the water could be forming in the duct lines or traveling from the air conditioner itself. 

There may even be a roof leak or plumbing issue causing water to enter the air system. 


If the duct is sheet metal without insulation or if the insulation is damaged, any break in the line will allow the hot air from outside to contact the cold air blowing through the ductwork. Next thing you know, there can be mold growth from the condensation forming in the system. 

Leaky Boot

Another common cause of condensation is a damaged boot. This is the piece that connects the duct to the vent’s grille. A break can often be patched up or replaced. 

Clogged or faulty condensate drain line and pump

This is often the following assumption and means that water travels from the unit, through the ductwork, and to the vent. Condensate is the moisture that an AC system removes from the air. It’s often pumped away with condensate and flows into a drain pan that takes water outside the home. Some things that can go wrong are the pan or the line becoming clogged and overflowing. If there’s a pump, the pump could malfunction. 

Frozen evaporator coils

Another possibility may occur if you notice that your home isn’t staying cool. This is a result of evaporator coils freezing. The melted ice can drip into the ductwork and be seen on the air vents. 

A clogged filter or refrigerant leak is likely the cause. This is one case where it is definitely time to call a professional. The strain on the system can cause compressor failure – a huge problem.

Remember never to handle refrigerant chemicals on your own.

Looking for more tips to keep your house cool in the summer? Contact our team today for information, expert advice and a free estimate for a new air conditioning system!