Thanks, ToolGuy. I already tried them. The problem is that they don't have coils listed that you can punch "buy one now" and when I asked them for one of their instant quotes, they never responded. Their quote form has a lot of questions I don't know how to answer (like fin height, fin length, fins per inch) so I put "any" in the blank space. I suspect they didn't want to deal with me if I didn't know. Truth is that almost any water coil that fits into a 16"x20" duct would work for me.