Well...just an update on this issue. I've had a few more contractors out to look at my current system and give me quotes for a seperate system for that bonus room. One is selling a Lennox 1.5 ton heat pump and came in at $5100. He said no bypass was installed and there is no way my current 2 ton system would do the job.
I had the GM of the original contractor, who installed the zone, come out and said that the existing unit is not big enough and he said i needed a seperate system. His quote was $5900 for a trane 1.5 ton heat pump.
What I really need opinions on is how much the original contractor should credit me? He said a partial credit but had to talk to the owner to determine how much. One of the contractors that gave me a quote indicated i'd be lucky to get half my money back. In my opinion, the system should never have been installed so why shouldn't i expect more of a credit?
I asked him if they did a load calc and he said the salesman that did the work is no longer there and they don't have his records.
Thanks again for the help on this.