Been doing some research/studying, and came across this nugget on my local electric company'a website:
"The average 80% standard oil or gas furnace lasts 18 years. Most high efficiency 90%+ furnaces only last 12 years due to their longer run times and design characteristics."
Is this an accurate statement? I had not even considered durability as a consideration, probably because I have had the same furnace for 25 years.