I am living in Milwaukee in a 1220 sq. ft. single story house built in 1984. I'm looking to replace the Armstrong single-stage 60,000 BTU gas furnace that is original to the house. I've got my bids narrowed down to two two-stage variable furnaces. The first is the Carrier 58UVB Performance 60,000 BTU furnace. The second is the Energi Air (Goodman) GMV95070 70,000 BTU furnace. As far as I can tell, the specs between these two furnaces are similar, the pricing is similar, the warranties are similar, and both qualify for energy tax rebates. I'm sure both contractors would do a good job, though the Goodman rep explained what the workers would be doing much better, including removing a vent from the the bottom of the return duct in the basement and putting in a radius bottom boot around the electronic air filter. I don't know how much efficiency that modification would really add, nor had I heard of Energi Air as being a part of Goodman. Has anyone used, installed, or otherwise found out any good/bad things about these two furnaces? I would really appreciate any and all advice, as this is the first furnace I've had to replace. Thank you very much!