Add second furnace
My daughter lives in northern Illinois. She has a two-story house with an unfinished basement, and about 2200 square feet of finished space. In the summer the second floor is hot, and in the winter it's freezing. The house is about 45 years old, and the furnace is about seven years old. I know some two-story houses have a second furnace and AC. How easy is it to add another furnace to an older home? Would it go in the basement? She has lived there about three years, and although she has had the furnace serviced, she really doesn't have a company she knows and trusts. She added more insulation when she moved in. Thanks for any help.