Selling condo, buyer says furnace is "end of life", & wants $5k, Its older but works.

[Doraine Warner]

Furnaces can run for over 30 years, I have read, we have had some that did. The furnace is 20 years old, but we've had no problems with it at all. It seems a bit like a money grab during escrow to me. We are selling it to them at a good price, and there are not many condos for sale in that price range. We actually sold it before the condo was even listed on the MLS. We are considering putting back on the market. I have never heard "the end of life" bit before, and we have sold dozens of real estate properties. Opinions?