The searching starts at a complaint about the house
Drafts, noise, condensation and a room nobody uses in summer are what people actually type, and most dealer sites do not appear for any of them.
A cold room, a window that sweats, outside noise that will not stop, a door that sticks every summer, and a room that runs ten degrees hotter than the rest of the house are all common searches with real volume and no commercial competition.
The person searching does not know windows are the answer, or does not know they are the whole answer. Some of the time they are not, and saying so is part of what makes the content credible.
Condensation is the strongest example. Homeowners assume it means the window is defective, when it frequently means something else about the house, and there is very little honest writing about it from anybody selling windows.
Answering these properly turns a complaint into an informed inquiry. Somebody who has read a clear explanation of why a room is cold arrives at an appointment ready to talk about solutions rather than suspicious of being sold to.
This is also the material that earns links and gets referenced, which matters in a category where almost every page on the internet is trying to sell something.