we have them in the majority of our windows. In the winter, we could not get our bedroom to be over 63º when it was dark out, but we put the insulating shades in and now we can get it significantly warmer. We open ours in the day, then close them when the sun isn't on them in the winter. In thesummer, we do the exact opposite. I wanted to get them for our windows in the front of the house, that get the most amount of sun in the summer, but we also wanted to be able to see out of them so we can look out the windows.