The window is only one part of the equation
The install method, flashing plan, sill condition, frame material, glazing package, trim restoration, and how much sun that wall takes matter just as much as the unit you choose.
Build a complete scope
- Whether the property sits in a reviewed historic area, checked by address
- What is installed now and whether the sash merits restoration
- Openings measured individually, especially across added-to elevations
- Solar heat gain and air sealing rather than insulating value alone
- Flashing on shaded elevations, trim restoration, disposal, and warranty
Roswell context
The mechanism that matters for windows here is heat and water rather than cold. Humid Georgia summers make solar heat gain through the glass the dominant comfort factor, which reverses the advice written for northern states where insulating value leads. Storms arriving on the Chattahoochee corridor drive rain against elevations horizontally, so the flashing and air sealing at the opening decide how it ages far more than the unit specification does. Tree canopy keeps shaded elevations wet long enough that any detailing shortcut shows up quickly, and repeated additions mean openings on one house can span several construction eras.