I bought my house about 6 years ago, which means my furnace is now about 26yr old. Everyone that has cleaned it says that it was made on a Tuesday, meaning it was put together VERY well. I'm reluctant to buy a new since mine has served me so well. However, at times when we go outside we can smell gas. The utility man stated that was from my furnace not coming on right away and that at some point in the near future I would need to get a new one.
I've never bought a furnace and there are so many types even within the same name brand. Anyone have any good experience in buying one and it serving them well?