I'm after some advice for a new kitchen/living/dining room that we r having built. Across one wall will be 3m bi fold doors with about 1 1/2 m of large windows on each side with 40cm high sills. So... A large expanse of glass. What be your advice about whether to cover them. I don't want it to be too cold in the evenings if we don't have anything but I also don't want it to look stupid with big flouncy curtains that will be enormous, heavy and expensive!! Help!