Under no circumstances should you ever see water around or inside your AC unit. As soon as you discover a leak, be sure to turn off your air conditioner and call for help right away. Turning off your AC can help prevent further damage to the electrical components of your AC and limit the amount of water damage to your home. A clogged drain line, a frozen coil, or a drain pan that has a hole inside the pan could cause the water leak. Remember that an HVAC unit that receives regular twice-annual maintenance is likely to need costly repairs.