A new, high-efficiency furnace can save you money in the long run, so if your furnace needs replacement, it pays to get a new high-efficiency model. But does your furnace need replacement. Do you want a new furnace because your present one isn't heating properly or is making too much noise? You may find that simple repairs are all that's needed. If you're considering a new furnace to eliminate problems with an older one, first read through these common problems and their fixes--this information just might save you a bundle.