Question about windows for acoustics
In the northeast and planning to replace 18 casement windows as part of a renovation project on a late 1960s home.
An adjacent apartment building (~30 feet) has a loud fan that turns on in roughly 40 minute intervals for about 10 minutes. The wall that faces this fan is mostly original single-pane windows that will be replaced, and we hope to significantly improve the acoustics and energy-efficiency of the home. After researching window options, we noted that different window technologies can provide different STC/UTC ratings, but we do not know what window rating will be needed to dampen the noise inside our unit.
We have quotes for Andersen 400, Jeld Wen Traditional Plus Clad, and Pella Proline for new construction frame, no grilles, dual pane windows with Low-E Argon fill. The thermal performance seems similar, and from looking at online performance data the STC/UTC ratings are 26/22, 30/25, 27/24 respectively. It seems that except for Andersen, higher end options can get STC/UTC to around 34/28 with some combination of dual or triple pane, uneven lite width, and/or lamination. Our contractor has expanded the search to look at higher end versions of those brands that support these choices as well as Eagle Axiom and Marvin UC. It may be difficult to get quotes for all the possible combinations of brands and glass options.
We don't care at all about external appearance. We would like a white painted wooden interior frame, but don't care about fancy wooden trims. When we visit window stores, the salesmen mostly want to focus on window appearance issues, and they only discuss price in vague terms. We really just want a quiet window with reasonable cost. Does anyone have any advice on window series we should focus on to maximize acoustic performance for lower cost? Should we consider any other companies? How much extra should we expect to pay to get close to 34/28 acoustic performance over the basic A-400, Jeld Wen, and Pella Proline? Thanks.