Staying cool in a bathroom is usually not much of a problem, but staying warm certainly is. In order to be comfortable in a bathroom, you need to be warm, in part because you spend so much of your time in there without clothes on. This is a challenge because the principal material in a bathroom is tile, whether stone or ceramic, neither of which is a material known for its inherent warmth. In fact, ice cubes exude about as much chilliness as these surfaces do. To make these surfaces comfortable to the touch in colder months requires some thinking that goes beyond the basic heating system, whether you use a boiler with hot water heat or a furnace to produce forced hot air.