Dirty coils and low refrigerant pressure could cause the evaporator coil to freeze up and then defrost. When that happens, it releases more water into your cooling system’s main drain and emergency drain than they can handle. This leads to (in case you haven’t been paying attention): air conditioner water damage!

Can air conditioners cause water damage?

As handy and inexpensive as they are, window air conditioners can often cause even more water damage, as they may leak right onto the window sill, damaging it permanently and certainly giving mold and mildew the chance to take hold and do its damage. Most often, a window A/C will leak because it is not level.

Can AC cause leak in ceiling?

The number one cause of an air conditioner leak is a clogged condensate line. When warm air blows over your AC’s evaporator coil, condensation forms. … The water puddles in your attic and eventually leaks through the ceiling of your home.