I wouldn't bother, it was just a statement of why you can turn them round in winter. I reckon you'd lose more heat through the roof
hehe, depends where you are & how hot it is & it really does help as the grey side absorbs heat if the sun is hot enough. This summer should be good, try it
I never get to go anywhere hot!. I usually leave the silver on the outside all the time. It would freak me out having it on the inside!
and if you really want to go to town....fit a another passive roof vent and run a duct from one to the other....