Windows in Anchorage leak heat for as long as the dark lasts, and the inlet wind finds the sash that faces the water. Frost on the inside glass, fog in the seal, and a stool that stays wet are the usual report. A whistle in a higher-ground bedroom is not the same as a rotten sill on an older crawl-space wall. The house was built for cold first. The bad opening is undoing that.
If a supply line shares the cold wall, the draft is a plumbing risk on a hard night. Say so. Storm panels that trap moisture will rot wood while you wait, and the waiting season is most of the year. Full-frame replacement opens an older Anchorage wall that may not be square. An insert on a soft sill repeats the stain. Feel the wood with a hand, not a guess.
Count the bad openings before the whole house becomes one order. The inlet elevation and the quiet side do not deserve the same scope. A meeting rail that misses will not be fixed by a casual bead, not in this wind. Ask how the new sill sheds water and what closes a deep gap. You want those rooms livable and the trim dry.
Set the glass while the long daylight lets you flash and close the hole. Doing it in the dark turns the room into a wind tunnel and can freeze the line in that wall. If a claim is open, photograph pitted or failed units and the stained stool first. Houses left without heat show the soft sills when someone comes back. Occupied houses show ice and a furnace that never catches the windward room. Ask for a set that can be finished in weather that holds.
Say how many windows, which rooms face the inlet, and whether the sills are soft. Name the part of Anchorage. Have the deductible only if the claim is already open. The next dark stretch will run the same whistle. Call the number on this page.