[bdesj]

I`m not sure whether it`s best to leave the curtains/shades closed in cold and sunny weather for insulation purposes or to open them up, losing the extra air layer in favor of "greenhouse" heat. I guess it depends on temps, angles, how well sealed, and other specific factors, but maybe there`s some rule of thumb or general recomendation?

Sorry if this has already come up- I tried a few searches, but it`s tough to find a good search term to lead me to the info I`m looking for.