Q: We are looking to buy an older house that has a very unusual furnace. The home inspector calls it a gravity furnace, but I think it looks more like an octopus with these large pipes that protrude ...

Two weeks ago, I began a reply to J. McC’s questions about replacing his 1920s gravity warm air furnace (the “octopus”) with a new forced air furnace. He was also concerned about how to find a ...

Q. Jean asks: I live in a 57-year-old home, heated by the original "gravity" furnace installed when the home was built. During the winter months, water condensation appears on some of the windows, ...

Most homes will use a combination of a furnace and an air conditioner to control the temperature of the air inside the house.