As I understand it, tiles and stone feel cold, because they conduct heat easily and therefore if they are 20C, they will happily pull heat out of your feet (@37C).    Am I correct that to avoid this effect, you will have to permanently heat your tiles to something like 25C, whilst perhaps engineered wood or carpet need no heating? If so:   - 1/ Wouldn't this source of heat not be problematic in summer? Should I always walk around with socks/shoes on to avoid this? - 2/ C