Windows in Nevada face a southern sun that cooks seals and a northern cold that finds every gap. In the Mojave towns, west glass turns a room into a hot box and the frames chalk and crack. In the Great Basin and along the Sierra, the complaint is a draft, frost on the pane, and hardware that binds on a cold morning. Wind is the shared test. Dust rides it in the south. Snow and ice ride it in the north. A single product speech that ignores the town will miss the opening you actually have.
Say the failure. Fog between panes means the seal is finished. A soft frame means water found the wall, which in the south may be a rare storm or a bad sill, and in the north may be ice. A window that will not lock is hardware until the frame is racked. Count the openings and name the direction. Aluminum single panes still sit in older southern houses. Wood sash still sits in older northern ones. Vinyl inserts are not automatic in either place when the frame is rotten.
Ask whether the work is an insert or a full-frame job. Full-frame work matters when the sill is soft or the wall needs new flashing. Ask who finishes stucco in the south or trim and siding in the north. Ask how the sill sheds water, because the rare southern cloudburst and the northern wind-driven snow use the same mistake. Ask what fills the gap around the frame. A pretty unit with an empty gap will whistle when the afternoon wind arrives.
Do not make the call a lecture about a utility bill. Make it a count, a climate, and a condition. South glass is a heat and ultraviolet problem. North glass is a cold and sealing problem. Say which house you are in. Call the number on this page.