Question on older central air replacement
I am looking to replace my 25 year old central air conditioning units. I have 2 units. A 2.5 ton for upstairs. A 3 ton for downstairs. I also have air handlers in both the basement and the attic. My current system runs on the old refrigerant (r22) so I am looking to upgrade to the new (410a). Since I plan on moving within the next 10 years, the contractor recommended going with the the Trane XB13, which I understand is one of the lower models Trane makes. According to the contractor, my current air handler has to be changed also, and he noticed that it was a 110 volt system. He says most air handlers run on 220 volts and to avoid costly rewiring he recommended going with an ADP air handler. I guess Trane doesn't make 110 volt air handlers. His price for this work is just under $13,000, which includes everything including replacing my existing outside electrical boxes, old air handlers, and both condensers (2.5 and 3 ton). He also has to run new lines up the side of my house to feed the attic system. My question is, does the scope of this work sound correct and is this a fair price?
Thanks for any help.