I have inquired abotu central AC with an local HVAC company. They recommended using carrier 24ABC636 condenser and fx4dnf036 air handler. I tried looking these up on the carrier site but the numbers seem to be a little different. If I am going to spend the money I want to do it right, is carrier a respected brand, are the models listed any good? Are there any tips, tricks or gotchas i should be aware of? Thanks!