Exactly this same question has been popping up on social media sites for over a decade. It's an old red herring, and Jehovah's Witnesses must find it tedious and tiresome to refute the idea that most Kingdom Halls don't have windows.
However, since I posted my comment here, nearly three years ago, the question is academic now that Covid-19 has effectively stopped all Kingdom Hall meetings for about two years. Zoom is the main method of Jehovah's Witnesses continuing their meetings. They stay at home, switch on their devices, and sit through their meetings as before, just not together in one hall. As far as I know, they never resumed meeting in their halls, even when Government restrictions were lifted, and, as of January 2022, they are still not using their Kingdom Halls for meetings.
Perhaps that will get questions such as this buried, once and for all.