Windows in Denver get hit by hail, baked by high-elevation sun, and drafted by the nightly drop. A storm can crack a pane or pit the glass and leave the frame standing. Fog between panes means the seal died, sometimes from impact and sometimes from age and the temperature swing. Brick openings in older neighborhoods are often odd sizes with weight pockets and thick sills. A tree lawn does not protect the second story. North windows draft. South windows overheat on a clear winter afternoon when the sun is low. Chinook days make the swing worse. This is a basin pattern, not a foothill wind tunnel and not a coastal leak season.
Say the failure. Cracked glass, fog, a rotten sill, a sash that will not lock, or a draft you can feel at the floor. Count the openings and say which ones faced the storm. An insert into a hail-racked or rotten frame will fail early. Full-frame work should say who repairs brick mold and interior trim, how the flashing ties in, and how the sill sheds meltwater. Ask what fills the gap. An empty gap at this elevation is a condensation and draft machine in January.
Do not turn one broken pane into every window, and do not ignore a whole west wall that the hail actually found. Hardware is a smaller call. A soft sill under a roof valley is a wall call. Say which you have. Skip any promise about the heating bill. The local issue is impact, seals, and the daily swing.
Brick openings do not forgive a unit forced in square when the hole is not. Say if the sash is original, if the weights are still in the pockets, and if hail broke glass only or also racked the frame. That is the difference between a pane and a full opening.
Bring the count, the direction, and whether the damage showed up the morning after a storm. Call the number on this page.