I've said elsewhere in the thread, but insulation does little to help in the summer months. Fiberglass insulation mostly protects from convective cooling/heati

I've said elsewhere in the thread, but insulation does little to help in the summer months. Fiberglass insulation mostly protects from convective cooling/heating (i.e. airflow). Heat in the summer is mostly through conduction and even more-so radiative (near infrared). Windows treatments could definitely help there, but unless you want everyone's windows to be mirrors, it likely won't help that much.