In air conditioners, water accumulates in the condensate drain pan as a byproduct of cooling. If the pan overflows, water can leak onto the floor or ceiling, causing damage. Manufacturers design AC units with features to prevent this, such as overflow switches and condensate pumps. Service providers can diagnose and fix issues related to water in the drain pan, including clogged drain lines or malfunctioning pumps. Homeowners should monitor their AC units and call a technician if they notice any water leakage.