I currently have a relative high efficiency gas furnace and air conditioning system.
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 later?
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.
Thanks.