9 Reasons Why Your AC Vent Is Dripping Water
in the Summer

Water leak from your AC vent is a major concern. Apart from the water stains and discoloration around the affected area, it could also signify an underlying problem that requires urgent attention.

In this article, you’ll learn some of the reasons for AC vent dripping water in the summer with some recommended solutions. Where the solutions aren’t a simple DIY, we recommend taking advantage of Oviedo, Florida AC repair by Tim Benjamin Air and Heat.

Dirty Air Filter

A dirty air filter can lead to an AC vent dripping water in the summer. The blocked air filter will cause freezing within the AC. After turning off your AC, the condensation will drain off via your AC vents as the frost melts.

Changing the air filters at least once a month over the summer will help prevent this problem while maintaining excellent indoor air quality.

Condensation Around Uninsulated Ducts

Do you have air ducts running through the attic? Poor insulation in this area causes condensation to build up within the system, draining via the AC vents. Wrapping up the ductwork with air duct insulation can solve this problem.

However, you need access to the attic to ensure you can examine the problem area. If there’s no insulation, head to your local improvement store to buy fiberglass batts (R-11 and R-13) and wrap the ductwork.

Air Leaks From the Vent

If air escapes from the AC vents instead of through the grates, it will lead to condensation. Over time the condensation will turn to the drips from the vents.

The best way to fix this problem is to feel for air escaping around the vents. If you find air flowing from anywhere other than beside the grates, you can apply some caulk to the affected area to seal it.

Blocked Drain Line for Condensate

Condensation accumulating inside the air vent can lead to water drips from your AC vents. The condensation often builds due to a clog in the drain line for condensate.

There are a few possible causes of the clog, but you’re more likely to experience the problem in systems running through the attic or similar areas in the home. Issues with the condensate drain in such areas cause water to overflow into the air vents and air ducts.

You can solve the problem by examining your AC’s outside component (the condenser unit). Check to see if the drip pan is too full or overflowing. If it is, you most likely have a clogged drain line.

Rust on the furnace is another common symptom of a blocked condensate drain line. If ignored, the rust can lead to a total system shutdown. Call an HVAC expert immediately if you notice rust on your furnace.

Frozen Evaporator Coil

When your AC’s evaporator coil freezes, the ice will melt after shutting down the system. The resulting condensation may drip out of the vents and into your home. If you notice frost in your evaporator coils, call in a professional to get a comprehensive system check.

Refrigerant Leak

Refrigerant leaks are a common reason for AC vents dripping water in the summer. This is especially true when the water leak isn’t heavy. Clogged condensate drains cause more water leaks overall. A refrigerant leak has a similar effect on your system as a dirty air filter.

Low refrigerant levels make it hard for your AC unit to adequately remove humidity from the air inside. Water removed from the air thus stays on the evaporator coils for too long, freezing over. The condensation will drip out of AC vents as it melts.

If you notice low airflow in combination with water drips from the air vent, there is a good chance you’re looking at a refrigerant leak. You should never ignore low refrigerant leaks for too long, as extended exposure to this compound is bad for your health. Therefore, it’s in your best interest to speak with a licensed HVAC professional to identify and repair all leaks.

Plumbing or Roof Leak

A plumbing or roof leak above the ductwork can cause water to move through the system and out through the AC vents. You can solve this problem by following the leak to find its source. If it’s a roof or plumbing-related leak, you need to correct it as quickly as possible.

Broken Condensate Pump

Standard condensate or sump pumps feature a float switch designed to turn on the pump when the water reaches a specific level. Excess water in the drip pan is often a sign of a broken switch. You can correct the problem by manipulating the switch to turn it back on. The switch becomes unresponsive due to limescale or scum buildup.

Cleaning the area with some bleach can remove the buildup and keep the pump functioning optimally. Check for a visible switch if you can’t find a cable. If you can’t figure out the switch, call in an HVAC professional to help you.

Poor Installation

If you hired an inexperienced HVAC technician to install your unit, you might end up with water leaks through the air vent. The unit or drain pan tilting to one side leads to drips as the condensation pools. However, this is only a possible cause if you notice the leaks after a fresh installation.

Solve Your AC Water Leaks Today

Seeing water leaks in your home is disconcerting. Apart from the inconvenience, the leaks can cause structural damage if ignored long enough. Discolorations on the ceiling or walls may require patchwork or repainting, and affected floor boards will decay over time without replacement.

Fortunately, most cases of AC vent dripping water in the summer have straightforward solutions. Our experts have years of experience correcting these problems and giving homeowners peace of mind.


Call Tim Benjamin Air and Heat Oviedo, FL, at (407) 340-2827 if you find your AC vent dripping water in the summer. You can also talk to us to know more about AC maintenance and how it can help you prevent water leaks.