I don't know, but my house is very cold at 60 cuz i can't afford to keep heat higher. My toes and fingers are always cold. I wear knit gloves IN the house with the tips cut off. I have to wear 2 thick pair of socks. Last winter my toes got frost bite!! Toes got swollen and pink.Went to doc said floor too cold. Said wear very warm foot ware and toes will get better in spring. Usually cold feet and hands are circulation problem. But is your house too cold? Try do what i do.