Windows in North Carolina draft in the mountains, fog in the Piedmont, and seize on the coast. A cabin sash that leaks winter air is a heating problem. A Triangle or Triad unit fogged between panes has lost its seal to humidity and a long cooling season. Salt on the Outer Banks and around Wilmington pits hardware and swells wood until the paint line is the only thing holding the sash. Sandhills sun bakes a different set of seals. The symptom matters, and so does the side of the state.
Ask if the work leaves the old frame in place or opens the wall. Inserts are reasonable when the sill is solid. They are a mistake when condensate, blown rain, or years of coastal air have turned the sill soft. Full-frame work should name the flashing and who repairs trim inside and out. On the ocean and the sound, the fastening and the flange are what the wind will test. Ask who answers if water enters beside the unit rather than through the glass.
Old wood in a piedmont bungalow and impact-rated units on a barrier island should not be described with one brochure sentence. If you intend to keep wavy original glass, say it. If wind racked the frame, a pane swap will not square the opening. One rotten bath window is a small scope. A wall of units facing the water is not. Ask for the efficiency figures on the whole unit. A sticker is a lab note, not a promise about how the room will feel.
Count openings and name rooms. Mention flaking paint on an old sash before anyone sands. A single cracked lite in a true frame can stay glass-only. Hardware crusted by salt is a repair of its own. Ice in the High Country can rack a unit that a Wilmington summer only fogs. Tell the truth about which one happened so the job does not swell.
Bring the count and the coast, the clay, or the ridge. Windows in North Carolina fail for a local reason, and that reason should be the first thing said. Call the number on this page.