When your system is running in air conditioning mode the surface temperature of the indoor coil is well below the dewpoint. This means that the moisture in the air condenses on the indoor coil. Many people are not aware that the air conditioner not only lowers the temperature of the air, but it also removes moisture from the air. This moisture runs down the coil into the condensate drain pan, and then into the condensate drain itself. Over time these drains can become clogged, and when they do, the condensate takes the path of least resistance. If your indoor unit is in the attic this can result in water damage on the ceiling when water leaks out of the equipment. For this reason, all systems installed by Brackin Heating & Air come with auxiliary drain pans and safety switches that turn the system off as soon as water is detected, long before ceiling damage occurs. If condensate drains are flushed and treated once a year it virtually eliminates this problem, and this is a good reason to have yearly maintenance performed. Damaged drains and loose fittings can also result in leaks, but clogged drains make up the vast majority water leaks from air conditioners.