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Yes, it's just as loud with heating. It's the fan. Not a defective sound. Just wind sound. Wonder maybe since this is a very old unit, I could get a newer quieter fan?

The filter hole size is 20" by 14". I have tried it with the filter out, same results. No "V" shape. The unit is right up against the wall on the other side of the filter. Basically, you open the...

The noise is coming straight from the return vent through the filter, since the fan is right on the other side of the filter.

I have a small 850sqft condo. Lived her a couple of years. I have an old Borg Warner 65000 input BTU/HR unit. Model P3UGD080N6501A. Its an older unit. There is only one return in the condo which is...