My furnace has started making a loud humming noise while it's heating. When I turn on only the fan, it doesn't make the noise, so I think it's the inducer motor (also notice the inducer motor is warm to the touch after running). I can order the part off Amazon for about $300. How difficult would it be to replace on my own? Alternatively, how much should I expect to pay a furnace guy to come do it (labour only)?
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