Name the problem
Separate a failed seal from dirt on the glass, and see what a crack, a draft, or water at the sill usually points to.
For Las Vegas homeowners
Fog between the panes, a crack, a sash that will not stay put, or water at the sill. This site explains what those problems usually mean and what a repair company is typically asked to do.
Separate a failed seal from dirt on the glass, and see what a crack, a draft, or water at the sill usually points to.
Glass, insulated units, hardware, screens, and frames. This is a map of the work, not a price list and not an offer.
An independent referral step is planned for Las Vegas. It is not running, and no repair company is attached to it.
A repair company will ask for a few facts. Keep them in your own notes. There is nowhere on this site to submit them.
Las Vegas summers put real heat on glass and on metal or vinyl frames. Nights cool off. That swing is hard on the seal between two panes. A summer rain can also be the first time water shows up at a sill that looked fine in dry weather. Those are reasons to look closely. They are not a diagnosis of your window.