JackpipE wrote in news:9bf42cd7-45a7-4dfa-9dde-
:

I just had AC service done last week and the technician said that
there were no freon in the system at all. As far as I know frean
doesn't just disapper and since it worked fine last summer there must
be a leak. So he added 8lb and the system works fine but I noticed
some kind of white sludge on a plastic cover of my basement window
next to the copper freon pipe. Here is a pictures of what it looks
like: http://e-pixel.net/freon.jpg
Is that the place of my possible leak?

Jack

Out of curiosity:

8lb at ? per lb? If unknown, what was total bill?

What's your approx location?

Was it R22 or 410A?