Start with conditions, not a product
Grade, slope, and how a sill drains after a mountain downpour usually matter more to the outcome than which window brand ends up in the opening.
Build a complete scope
- Whether original sash is repairable, which historic review may expect
- Whether the property is designated, confirmed by address rather than by street
- Openings measured individually, since older houses rarely use standard sizes
- Frame material and thermal break for mountain winters, plus flashing detail
- Access equipment on a steep lot, trim restoration, disposal, and warranty
Asheville context
The mountain climate points this specification somewhere different from the coastal or piedmont advice. Asheville has real winters at elevation with repeated freeze-thaw cycling, so frame material and thermal break matter more here than in the rest of the state, and the air sealing achieved at the installation matters more than either. Intense rainfall arriving against a slope tests flashing at every exposed opening, particularly on the uphill elevation where water is moving rather than merely falling. Slope also has a plain practical consequence for this trade that has nothing to do with the units: on a steep lot, staging and access equipment for upper-floor windows is a real part of the cost.