Hi -

We recently had several Pella windows installed. The architect series casements are fairly sound-proof. The pro-line double-hungs, which face the same direction, seem to allow much more noise. There is a high-pitched hum in the room where they are located which is absent from the room with the casements. It always sounds in that room as though the windows aren't quite closed, even when they are locked.

Any suggestions as to cause? Is it the windows, or the installation (I dread pulling them apart, as I just finished doing the interior stain work myself, while in denial about the annoying noise level...)

Thanks for your ideas.