jim

what about your service company? they sell new HVAC don't they?

ask friends, neighbors, people at work.

I prefer small HVAC shops where owner is involved in all aspects of business.

what is brand/mdl of your furnace? I like the idea of the system being of one brand although it's not necessary. you will need at the very least an outside condenser, matching indoor evap coil, and possibly new lineset.

if you have any hot/cold spots in home, now is the time to point these out for possible improvement.

if you post your location, perhaps a forum member can make a recommendation.

IMO
Good Luck!

Angie's list? And back-check with the BBB for complaints.