Short of the heat exchanger being compromised, you don’t ever NEED to replace a furnace. There does eventually come a point however where you will spend more in parts and labour than a replacement would be worth.
You’re welcome to pm me if you any question, and if you’d like I’d be happy to take a look at it for him next time I’m in the city. (No cost, no obligation)
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You bet your ass I voted
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