Hmmmm. It is inovative. The customer wants it that way.. Really? Someone did not do their job effectively. The customer was not educated propperly to make this decision.
It will cost a lot more in the long run. That rusty turd wont last forever and then what are they gonna do. Sure a 20 ton condensor is cheaper than a 20 ton RTU but here there are enough incentives by the utility companies that would just about cover the difference among other incintives like a cheaper bill every month.