My dad designed many kingdom halls. They all had windows, but were built during the 50s & 60s. There was a rash of vandalizing of kingdom halls, and I remember him talking about new halls being designed without windows. He wasn't happy about it...but then he thought buildings without light were ugly.
Ironically, having left, I now work for one of the largest window companies in the world. I conduct seminars, sanctioned by AIA (with CEU) credit, about glazing systems. Ihaveasavior, you are right that windows contribute to thermal efficiency...but I really don't think that was the issue. My own theory is that windows not only allow light in, but encourage people to look outside...not a good thing when the organization wants full attention...
Ihaveasavior...you sound angry. Most here are xjws...and you will find few here who will defend the organization on this or other issues.
Coffee