Windows in Utah take a winter inversion and a summer sun, plus a real freeze. Along the Front, glass fogs on winter mornings because the house is tight, the furnace is running, and the outside air is cold and stale under the inversion. Failed seals leave a permanent fog that wiping will not fix. Ice forms on poor panes. Canyon wind finds gaps and rattles old wood sash in brick openings. St. George reverses the complaint: west glass, chalked frames, and seals killed by heat, with only a light winter draft. Mountain houses live with snow, ice, and wood windows that bind.
Say the failure and the season. Condensation that dries by noon is not the same as a seal that is gone. A rotten sill from ice dam overflow is a wall problem, not only a window problem. Count the openings. Older brick houses on the Front often have odd sizes and weight pockets or old balances. An insert that leaves a rotten frame in place will leak and draft again. Full-frame work should say who repairs brick mold, stucco, or interior plaster, and how the sill sheds meltwater.
Ask what fills the gap around the frame. Inversion season punishes a hollow gap with condensation and a draft you feel at the floor. Ask about hardware that binds only on the coldest mornings. In the south, ask about heat on west glass and grit in the tracks instead. Do not turn the call into a promise about a heating bill. Turn it into the season you are miserable.
A bench house in a canyon wind will whistle at gaps a valley floor house keeps quiet. Say if the east wind is when the draft shows up. That is a Front clue, not a St. George clue, and it changes which openings are urgent.
Bring the count, the wall type, and whether the fog is between the panes or only on the room side. That distinction is the whole diagnosis. Call the number on this page.