Once upon a time, the most common furnace for a house was a ghastly monstrosity known as an “octopus furnace.” It sat in the basement of the home, burned coal, and distributed heat by letting it rise through large pipes that crawled up through the house. Inefficient, unreliable, costly, dangerous.
Obviously, furnaces have come a long way since then. We don’t have old octopus furnaces around in Florida (we rarely have basements!), but the changes in furnace technology over only the last two decades are impressive. If you have an older furnace (15 years or more), we recommend looking into the new models with their superior efficiency.