I live on the top floor of my apartment in the desert and the A/C is the biggest contributor to my energy bill. I know I need to insulate my place better but I don’t know where to start. The advice online is everywhere like some suggesting solar film and others saying solar film doesn’t do much. What have you all had success with to keep your house cool? I really want to know what works before I invest in anything- if there’s a diy that would help even better! #finance source