Sorry Chris but that is just wrong. A/C units need to run long enough to remove the humidity. If you oversize your unit it will short cycle and will run long enough to reduce the inside temp to the set temp but not long enough to remove the humidity. You house will be cool but clammy. Before I updated my boiler, I did a "Manual J" study which tells you what you need for heat and cooling. I talked to a HVAC Engineer and he asked me if our a/c runs non stop for a few days when it get's real hot and muggy in July and August. I said "yes it does" He said "perfect". ''That's just what you want it to do."