Ahh do you find it works for you? I've tried it and can't say it makes any difference for me, upstairs is still boiling with or without the curtains closed (and windows open) it's supposed too block the heat from coming in right? Well as I was out today I closed them see if it's cooler when come back but when I got back it was boiling still.I haven't opened my curtains upstairs for 3 days now!