Ok I'm getting the guy who installed the furnace back out, but I'm going to ask for a comfort specialist to come as well. I have some questions.
What do I say if he says a 2 stage isn't needed?
Can a heat pump work with a gas only furnace?
Last question and I'm guessing it's comfort based, would a same size replacement AC 2.5 ton and a dehumidifer be a better/equal/similar cost option as 2 stage AC?