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: Prioritize heavyweight fabrics like velvet , wool , or heavyweight polyester for natural heat retention.
: Look for "triple-weave" labels, which indicate three layers of fabric woven together to create a dense thermal barrier. Backings and Linings : buy thermal curtains online
: Can be retrofitted to existing curtains or bought as a "thermal-lined" set for maximum energy efficiency. : Prioritize heavyweight fabrics like velvet , wool
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