The problem with new furnaces (IMO) is that they are too complicated and high efficiency = high maintenance. If the furnace is 5 years old and has had regular maintenance done I don't think it's unreasonable to be annoyed if something fails, it's supposed to last 20 years.
If I had my choice I would take an old school furnace any day over a high efficiency one. My furnace is 8 years old and Ive had a ton of issues with it.
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