Air conditioning units are prone to water leaks and, consequently, water damage. The good news is that performing several maintenance tasks periodically can help to greatly reduce the risk of water damage.  Here are the most common causes for A/C leaks with tips on how to fix and prevent them without professional help: The drain line is clogged  The drain line is a pipe which collects the condensed water that the A/C unit has produced and transports it outside the house. Sometimes, the drain line gets clogged with algae, dirt, mineral deposits and even mould or mildew, causing water to overflow into the home.  If the drain pipes are clogged, a wet-dry vacuum can be used to suck out the water and debris from the outdoor drain pipe.  To prevent drain lines from clogging, a mix of half warm water, half bleach should be poured into the pipe once every 4 to 6 months. Installing an overflow shut off device on the drain line should be considered. The device auto...