My A/C guy just left. Nice guy and very knowledgeable. He will put a couple of systems together and estimates. Probably $10,000+. Sounds like a 4 or 5 day project. We will probably go with a dual zone, variable blower and variable Compressor/condenser unit. He likes Carrier history and was interested in a few pieces from the old system. He also said that Carrier often offers rebates on antique systems. LOL