My new 2 Ton Infinity System got installed this week. The 25HNA condenser unit towers over my 3 year old 3 Ton unit (38YDB). It's about 9" taller and being square compared to the older unit it is 2" wider and about 6" longer in perimeter. All this must add up to a lot more cooling coil area. Why do we have this major change in dimensions? Are the older units inadequate in some way?