Dealing with contractors can feel like a guessing game when the quotes don't match up. We initially called a guy out just to fix a sticky frame, but once he pulled back the trim, we found severe water damage and rotting studs underneath. It was a legitimate nightmare. To spot an upsell, always ask them to show you the physical damage or photographic proof. When checking replacements, I dug into the official Harvey window specs https://ubrothersconstruction.com/catalog/windows/double-and-single-hung/item/harvey-classic-vinyl-double-hung-window myself to confirm the structural ratings and sizing matched what the tech was claiming. Doing your own research stops them from inflating the scope.