With a bit of research and preparation, most people can install or replace their own furnaces. Homes that need new ventilation and other components, however, may pose too much of a challenge for most homeowners.
Gas and heating oil furnaces generally use standard-sized components, simplifying the installation process. Older units using uncommon connections, however, may require extra work. In addition, some areas require homeowners use a certified expert when dealing with gas lines, and some even require inspections.
Expert installers sometimes know how to get better efficiency out of an installed unit. Over time, seemingly small steps taken can save a considerable amount of money, so hiring an expert may be the smarter option.