Air Conditioning more complex everyday

Air conditioning is a pretty simple process right, well the latest problem the engineers are trying to solve is that since the government has mandated that system efficiencies have to be increased how do we achieve that.
The first path was to make the coils larger, simple right. Of course that creates another problem, that's right how we gonna get that big unit in the small space where the old one was.
So to solve that problem they are developing new coils that expand the surface area for heat transfer integral to the tubing so they can start reducing the overall size of the coils.
I think that is great, the only thing I worry about is if they can't keep the coils from leaking for 5 years now because the copper is so thin how much tougher is it going to be to repair a leak now. I guess they don't want us to fix them just sell 'em a new one.