I currently have a relative high efficiency gas furnace and air conditioning
The gas furnace exhaust is via a plastic pipe. Though the motors for the
furnace fan and the AC are not multispeed so they are not the highest
efficiency available but in 1991 they were pretty good for that time.
The furnace and AC are into their 15th year and it's my understanding that
the useful life of these items is usually 15-20 years.
I'm wondering at what point I should go ahead and replace my system? With
the price of Gas continuing to go up should I be looking sooner rather than
When I replace it should I go with another high(er) efficiency gas furnace
and AC [location is north central Illinois]?
or Should I be looking at replacing with a geothermal system?
Any thoughts, comments, things to look for, etc.