My furnace is leaking from the drain pipe, the pipe that drains moisture from the evap coil. It is a clear plastic hose that flows into my laundry tub. It is leaking about 20 gallons a day from this drain pipe. Is this normal? My water bill was just really high, because of this. How much water is suppose to leak from this drain pipe? If any at all? What is the drain pipe for? And how can I fix this problem? I weather has been in the 20's and teens the last few weeks. Could the cold weather recently with all the snow we got, over 20 inches have something to do with all this leaking from the drain pipe? I have gas heat with ac.

Thanks in advance for any help anybody might be able to provide me.