Windows in Seattle rot and sweat because the long wet season never gives the sill a real rest. Wood sash on craftsman houses drinks marine air, paint peels at the stool, and a meeting rail that looks closed still lets wind-driven rain through when a storm has a direction. Indoor moisture beads on cold glass through the gray months and runs down until the trim softens from the room side. A fogged dual pane is a failed seal. A soft apron is a leak. Do not treat them as the same visit.
Hills change which opening suffers. A Queen Anne or West Seattle wall that takes the weather off the Sound gets rain driven at the glass like a hose. A shaded north wall under firs stays damp and grows a film on the trim even when it does not obviously leak. Drips at a tub window often mean a weak fan as much as a worn sash. Say which rooms, which floor, and whether the frame is original wood, a vinyl insert, or metal that sweats.
Ask how far the work goes. Glass alone is not enough when the stool, the sill pan, and the joint against the siding have taken months of rain. Setting a new unit into rotten wood, then caulking the gap, hides the wet season instead of ending it. Thick plaster on older houses punishes a sloppy opening. Say whether the sash must still open for a bedroom, or whether the only goal is to stop the water.
If this is also a claim, leave the damaged unit in place until you have photos and have called. Otherwise name the bad openings in words and leave the rest of the house out of the first sentence. A sticky sash in August may be humidity. A drip in a November wind is an opening.
The drizzle will keep feeding a soft sill whether you pick a style of grid or not. Call with the rooms and whether the wood is soft. Call the number on this page.