What Causes AC Leaks?
AC leaks most commonly originate from a blocked condensate drain line. As your air conditioner removes humidity from the air, it produces condensation that flows through a drain line to the outside. When that line becomes clogged with algae, dirt, or debris, water backs up and overflows from the unit, causing visible pooling or dripping inside your home.
A second common culprit is a damaged or deteriorated drain pan. Over time, the metal pan beneath the evaporator coil can rust or crack, allowing water to escape before it reaches the drain line. Low refrigerant levels are another frequent cause — when refrigerant is too low, the evaporator coil can freeze, and when it thaws, it releases more water than the drain system can handle, resulting in leaks.
Factors That Affect AC Leaking in Mobile, AL
Mobile's humid subtropical climate produces large volumes of condensation inside AC systems, which increases the likelihood of drain-line overflows and leaks during peak summer months.
Older AC systems often have corroded drain pans, worn seals, and brittle drain lines that are far more prone to cracking and leaking than components in newer equipment.
Systems that receive regular professional tune-ups have cleaner drain lines and properly sealed components, dramatically reducing the risk of unexpected water leaks.
Improperly pitched drain lines or incorrectly seated drain pans can cause water to pool and overflow even in a relatively new system, making professional installation critical.
A severely clogged air filter restricts airflow over the evaporator coil, causing it to freeze and eventually leak as ice melts — making regular filter changes a simple but important prevention step.
When to Call a Professional for an AC Leak
While some minor AC issues can be monitored briefly, an active leak should be evaluated by a qualified HVAC technician as soon as possible. Continued leaking can damage ceilings, walls, and flooring, and can promote mold growth that creates additional health and structural concerns.
The scenarios below describe situations where professional attention is especially important rather than a wait-and-see approach.
Water Pooling Around the Unit
Visible standing water around your indoor AC unit or air handler is a clear sign the drain pan or drain line has failed and needs immediate professional inspection.
Ice on the Evaporator Coil
Frost or ice visible on the indoor coil points to restricted airflow or low refrigerant — both of which require a technician to diagnose and correct safely.
Persistent Dripping After Shutdown
If your unit continues to drip or leak water after being turned off, the drain pan is likely overflowing or cracked and should be assessed before the system is restarted.
Quick Checks to Perform Before Calling for Repairs
Running through these basic checks before contacting a technician can help you provide useful information during the service call and may reveal a simple fix like a dirty filter.
These steps are informational only — if leaking is active or significant, turning off the system and calling a professional is always the safest course of action.
Ready to Stop the Leak?
A qualified HVAC technician from Sterling HVAC Mobile can diagnose the source of your AC leak and recommend the most cost-effective repair path for your situation in Mobile, AL.