Your house has 10 centimeters of insulation, triple glazing, underfloor heating, and you still wear socks in January. It is not your house. It is the way we heat. A modern house is airtight. We seal every crack, we put in expensive windows, then we drill a hole in that perfect seal, put in a radiator that needs air circulation to work, and then we throw all that hot air out the window because we need fresh air. We heat air to 24 degrees, we throw it outside, we heat new cold air again, we throw it out again. It …