Quote Originally Posted by ProGroWannabe
A He was asking if people just keep shouting the same age old theory that mylar is way better than foil for reflective purposes, or is there truth in the statement.

B Also. the "example" you asked for in the bottom of your post about heat reflectivity---think infrared detection equipment. They woould not be trying to "keep heat" inside the room, just keep it from being visible to IR detection.
A. He didn't really ask a question... he attempted to make an educated argument and breezed over the most important fact. Then he pretended to ask a question.

B. I don't understand that...