Windows in Tennessee draft on the ridges, fog in the basin, and swell in the long western humidity. A cabin sash that leaks on a hard night is a heat problem. A basin or delta unit with mist between the panes has lost its seal to cooling season and wet air. Ice finds the gaps in older wood from Knoxville's valley to the hills around the capital. The west adds more months of moisture and fewer reasons to blame cold. Salt is not the story. The length of summer is, once you leave the mountains.
Ask if the frame stays or the wall opens. An insert is fair on a solid sill and a poor idea on one that condensate or blown rain has softened. Full-frame work should say how the opening sheds water and who restores inside casing and outside skin. Wind in the basin and the west will test the flange. Mountain cold will test the glass and the gap. Ask who answers for water that passes the frame rather than the pane. A promise limited to the glass should be heard as limited.
Keeping original wood on an older city street has to be said early. A racked frame after a limb or a wind gust will not be squared by one piece of glass. A single bath window is a small list. A front elevation of original units is not. Ask for efficiency figures on the whole unit, and treat the sticker as a lab note. Comfort in a west-Tennessee August is mostly the cooling system and the attic, not a slogan on the glass. Flaking paint gets mentioned before anyone sands.
Count the units. Name fog, a rotten sill, a draft on an eastern night, or glass broken by hail. Hardware that quit is a repair. Do not order a mountain window package for a delta ranch, or a beach-style story for a ridge cabin. Tennessee does not need either costume. It needs the side of the state and the symptom in the same breath.
Bring the count and the grand division. Windows in Tennessee fail locally, and the first sentence should prove you know where. Call the number on this page.