My air conditioning air handler is located upstairs in my two story townhome. I noticed the air handler is leaking water... it leaks from under the area where you change the filer. I noticed there is no water leaking from the pipe outside. I put a bucket under the unit for now... is this serious?

Probably not. Somewhere up there you should find a tube or plastic pipe coming off the unit that should be carrying away the condensation. Look for a kink or crack in this line.

Hope that helps. If not, let us know.