The more I learn, the more I find out how little I know. So I am asking, again, for comments from you all.
Lets say that I can't find a contractor that will/can do a load calc. I have narrowed it down to 2, from 6 interviewed. I am going with an Infinity/Evolution system. Contractor #1 says 3 ton is required to keep my home cool in our hot/humid summers. The other says 2 ton is plenty and 3 is over sized. #1 says if it is really 2 ton required(which he thinks is seriously under sized) the 3 ton, 2 speed comp and VS fan will alleviate some of the over sizing. #2 says no way, 2 speed and vs will not correct over size problems, and may exacerbate the humidity problem.
The current unit is 3 ton and the duct is too small-it will all be replaced.
BTW, I did my own calc(the sponsor here) and got 3 tons. But the more I have read the more I think I can't trust the #s. I think the calc is helpful and I learned a lot, but for proper equipment choice, considering all factors is important and a pro needs to be involved.
Bottom line-I want to go with #1(3 ton) for a variety of reasons. If my real need is 2 ton, will the 3 ton with VS and 2 speed over come at least a portion of over sizing?
Thank you for your comments and opinions!