Counterflow Chiller? I can make 20' of cfc for about 70 bones, but is 20' long enough? How long is your CFC? They all look 20-25' in the pictures, right?
~25ft is pretty standard. I just used the one I made (25ft) and it dropped the wort temp down to <2 degrees of the hose temp. Bobby M's tutorial is pretty straightforward if you are making your own.