Nah, the door vents are not the air intake but they are the combustion air
(for the water heater as well). I suppose I can put some insulation on the
inside directly opposite the burner area of the furnace to suppress the
noise where it is most intense.
But I'm hoping that I can select a new furnace that's not so noisy.
Yeah, come to think of it, in his case you're probably right. When I
care about the noise, I'm two flights up and all I hear is the fan, so I
thought of that first. The color showed it was on the slowest speed,
but I tried the other two wires, just in case they'd made a mistake.
They hadn't. So I sometimes shut the bedroom door to cut out the
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