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Mine started yesterday. I think it is the fan that acutally blows the air. Mine is super noticable with the fan speed set one click above off and heat all the way maxed. I can turn the fan speed up and notice a pitch difference. If I turned the fan speed full blast don't notice it.
I am just guessing but I think it has to do with the cold weather gumming up the grease or oil that is on the fan. Like I said this is just a guess.
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