This was my thought as well. I have an attic fan and monitor the temperature inside to control it. It regularly gets 120+ F in there on an 80 F day. I have to t

This was my thought as well. I have an attic fan and monitor the temperature inside to control it. It regularly gets 120+ F in there on an 80 F day. I have to think the majority of the heating of my house is coming from the attic.