Why is water dripping from my AC unit?

Water dripping from your AC unit is usually caused by a clogged condensate drain, dirty air filter, or frozen evaporator coil. This is a common issue that can often be resolved, but it's important to address it quickly to prevent water damage.

The most common culprit is a blocked condensate drain line. Your air conditioning system naturally produces condensation as it cools the air, and this water should drain away through a small pipe or tube. When this drain gets clogged with algae, dirt, or debris, water backs up and can overflow from the indoor unit. You might notice water pooling around your furnace or dripping from the ceiling if the unit is in your attic.

A dirty air filter can also cause water dripping. When your filter is severely clogged, it restricts airflow over the evaporator coil, causing the coil to freeze. When the ice melts, it creates excess water that can overwhelm the drain system. Check your filter first - if it's dirty or hasn't been changed in over 3 months, replace it immediately and see if the problem resolves.

In Ottawa's climate, frozen coils are particularly common during our hot, humid summers. If you notice ice on the indoor coil or copper lines, turn off your AC immediately and let it thaw completely before restarting. Running the system with a frozen coil can damage the compressor, leading to expensive repairs in the $1,500-$3,000 range.

For safety, turn off your AC unit if water is actively dripping to prevent electrical hazards or water damage to your home. While you can try changing the air filter yourself, drain line cleaning requires special tools and knowledge of your system's layout. A clogged drain cleaning typically costs $150-$250, much less than repairing water damage to your floors or ceiling.

If the problem persists after changing the filter, or if you see ice formation, it's time to call a licensed HVAC technician. We can safely clean the drain line, check refrigerant levels, and ensure your system is operating efficiently. For a professional diagnosis of your AC water issue, request a quote from Ottawa HVAC Pro.

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