I am researching purchasing a new furnace and one service provider recommended a York modulating furnace (97% efficient) and another recommended a 2 stage variable speed furnace (96% efficient). The second service provider said that for my 1050 square foot bungalo (*which is all one level with an in-law suite in the basement) I won't see much difference between a two stage and a modulating furnace so I would waste my money if I purchased the modulating furnace. He recommended an Amana 2 stage furnace. I could also purchase a York 2 stage furnace. I need advice whether purchasing the modulating furnace will really make my living space (both floors of the house) that much more comfortable or if a 2 stage variable speed furnace will do the job just as well. Looking forward to learning more. Thanks for reading.