Do ordinary curtains provide ANY energy/heat saving benefit?
Some years ago I read that “ordinary” curtains & miniblinds do not provide much in the way of energy/heat saving.
My housemate is sure her “ordinary”, unlined sheers (in the living area), thin cotton Battenburg lace (in the bath), and plastic venetian mini blinds in my bedroom provide energy savings if kept closed all the time. I say keeping every thing closed does nothing more than make the house look like a dark cave. Your opinion? And are there any so called energy saving curtains/drapes out there that actually help with heat savings, as they claim? Are there any on the market worth the cost? Most every wedsite I’ve looked at wants to sell something so they can’t be relied on to give an honest answer. Thank you for your time & thoughts.