Folks, thanks for your information (except for moe-air's unless he can explain why you should replace a Trane A/C unit every 10 years).

That would be because it is always best to install matching components , but not only that , you now have a new furnace and coil and a 10 yr old condensing unit that will begin to give you trouble within the next few years and when it does and you have to replace it , it wont be compatable with the furnace and coil you just bought and you will have to buy them all over again, that is unless the equipment you just bought and your lineset is rated for pressures high enough for puron