It never goes below 20C in my house, even when it's -30 outside. About the worst thing that happens is dry skin. But I'm in Canada where we prioritize insulation and heating system capacity. (Something has to offset the long, cold winters)

Or just do a few light exercises in the morning or whenever you get cold. (no offense intended. it simply works well for me)

Are you subtly trying to advertise to us with their marketing slogans?