[Normy]

You do NOT want too large of an air conditioner.

AC does two things:

1. Removes heat

2. Removes humidity

This second is the most important. If you put a large AC unit on a small house, then your unit will only run very rarely. The problem with that is that this allows humidity to develop, and that leads to MOLD.

A smaller unit that runs all the time is a better idea. You can figure on 15 years from your inside and outside unit, maybe a little less if you are in Florida, where it is going to run year-round and is subject to frequent lightning strikes.

Good luck!

N!