The D_97MC modulating variable-speed gas furnace delivers up to 97 percent AFUE. The furnace’s redesigned heat exchanger is small in size. The D_97MC’s tubular heat exchanger is small enough to fit in ...

The Freedom 95 Comfort-R™ variable-speed, modulating communicating furnace has a precise level of fuel control, which makes the furnace incredibly efficient, earning the Energy Star® rating, says the ...

Q I made energy improvements to my house, but my 25-year-old gas furnace does not keep it as comfortable as before. Also, I think my gas bills should be lower? Which 2008 furnace models are most ...