You need written heat load and duct calculations to make sure everything
is sized properly, oversize the AC and you will remain humid, undersize
it you won`t cool. Get a written guarntee on temp performance winter and
summer. Consumer Reports did a poll of apx 35000 over maybe 8 years on
basic reliability and found one thing obvious that was well known
already, Goodman takes last place. Do you have ducts inplace.
www.energystar.gov is a good place to research efficiency