Thank you for listening to the radio show. To answer your question the life expectancy of a furnace is 15-18 years. So I would say your furnace has done its job. The other consideration is the efficiency of your current system compared to a modern system. We find that many furnaces are severely over sized for the home they are installed in this reduces the overall efficiency. Another problem we run into is the ductwork in homes is often undersized further reducing the total system efficiency. Its all well and good to install a 96% efficient furnace but if the furnace is over sized for the home and the duct work is undersized your still throwing money away. Call us if you still have questions.

I have a home in Northern Delaware with a very old heating system that continues working without problems (I think it is about 30 years old). I have owned the home for about 13 years. At what point should we consider replacing this gas furnace?

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