Windows in Salt Lake City sweat in inversion season, ice up on the worst panes, and rattle when the canyon wind hits the bench. The house stays closed, the furnace runs, and moisture lands on cold glass every morning until the valley clears. A seal that has failed looks similar and does not dry out at noon. Ice dam water rots sills from the outside while the inversion is fogging them from the inside. Those are two repairs. Older brick openings on the Avenues and Capitol Hill are often odd sizes with old balances. Newer windows on the benches are larger and take more wind.
Say what you see and when. Fog that wipes off, fog between the panes, a draft only during an east wind, a sash that binds on a hard morning, or a soft sill under a roof that dams ice. Count the openings. An insert into a rotten brick-mold frame will draft and leak again. Full-frame work should name who repairs the interior trim and the exterior masonry or stucco, and how the sill sheds meltwater instead of holding it.
Ask what goes in the gap around the frame. An empty gap becomes a condensation machine in January. Ask about hardware separately from glass so a lock problem does not become a whole-house replacement. Do not center the call on a heating bill. Center it on whether you can see out in the morning and whether wind is entering on the bench. A valley floor house and a bench house do not share the same wind complaint.
January is when the diagnosis gets honest. If the glass clears at noon, you are looking at indoor moisture and a cold pane during the inversion. If it never clears, the seal is done. Say which morning you are having, and say whether the bench wind was up when the draft started.
Bring the count, the wall, and whether the fog is on the room side or sealed inside the glass. Call the number on this page.