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It sounds like a jet engine firing up when it kicks in and while is heating cooling the house.
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The first issue is that furnace is a lot noisier than the 18 year old york furnace it replaced.
I expected much less noise from a lennox 2020 high end model furnace.
Electric diagrams training single and 3 phase power systems motors run capacitors start capacitors troubleshooting the capacitor air flow problems with the air conditioner servicing the air conditioner lennox manuals carrier bryant payne manuals goodman manuals.