I have a house in which the furnace (ruud) is 21 years old and AC condensor (heil) is 20 years old. AC seems to works fine (but may be undersized) and the furnace works as well (but is noisy). Though I don't plan on being here more than 5 years, I'm thinking about replacing both units to stave off future problems and to save money on my utility bills.
Do you think this is a good idea? Or is it possible I can get 7 more years from them? I'm looking to replace them with cheaper units like Goodman. The worst thing would be paying to replace units that work with new ones that don't, so I hope a cheaper set can last awhile.