"One side of our house is largely glass so we experience a lot of solar gain. Consequently the upper level was always quite a bit warmer than the lower level. When we had our new two-stage, variable-speed furnace installed, they recommended we run the fan continuously to circulate the air. After one summer, we could tell a big difference. The upstairs was cooler and the unit was so quiet, we couldn't even tell it was on. And on top of that, it only uses about as much electricity as a 75-watt lightbulb." -Jack Goldman, Mount Vernon, IL   "Our cathedral ceilings made it difficult to keep the temperature even throughout the house. It always seemed too hot in one room or too cold in another. Now our new two-stage, variable-speed furnace holds the temperature rock steady in every room. We also needed a furnace that was extremely quiet because the unit sits right outside my recording studio in the basement. When we first installed it, I was skeptical about the claims the dealer made. But when it ran, I couldn't hear it at all and, more important, the microphone didn't pick it up either." -Jim Bordner, Fort Wayne, IN