The most common cause of air conditioners leaking is a clogged condensate drain line. Air conditioners produce condensation as they cool the air, and this moisture typically drains out of the unit through a small pipe or drain line. Over time, this drain line can become clogged with dirt, debris, or algae, preventing the proper flow of water and causing it to back up and leak from the unit.

Other potential causes of AC leaks include a damaged or improperly installed condensate drain pan, a malfunctioning condensate pump (in units with elevated drain lines), a frozen evaporator coil that thaws and overflows, or a refrigerant leak. However, a clogged condensate drain line is generally the primary culprit when it comes to AC leaks. It is recommended to have regular maintenance and cleaning of the AC system to prevent such issues.

what is the number one cause of acs leaking