Some people use aluminum foil to reflect heat on windows but I find it very depressing and bad-looking thing. My Chinese friends use 台州涂银反光窗帘布 but I have no idea what it is in English: they translated it as a silver curtain and galvanized curtain. According to them, it is available at least in Beijing's IKEA and Shanghai's IKEA but apparently not in Europe or I just cannot find the right term to describe the special curtains to reflect the heat. This material is like a aluminum foil canvas but more durable. It is easy to use during travelling and studying particularly in places where you cannot carry a 30kg central-cooling unit like here.
This is how it looks like on window: the side of sun is covered with this silver curtain and the other side to the room is the canvas knitted together. It is very hard to notice this unless you know what you are looking for but it keeps the room cooler and darker -- great!
What is the name of the silver curtain? Which kind of factors should I consider in choosing a curtain? Which silver curtain reflect most heat and blocks well light?