Why not remove the cold, hard floors and swap for a decent underlay and carpet? A decent PU underlay and carpet will provide you with thermal insulation and give you far more warmth throughout your home.
Many of our customers, including the charities and councils we work with acknowledge this benefit and are swapping out older vinyl and laminate floors for carpet and underlay. Yes, there’s initial costs involved with doing so but over the next few, uncertain years regarding energy prices, this will save you money and give a cosier feel to your home.