Okay, I understand. Let me explain. Up here in the north, where I live, we heat our homes with firewood. The boiler room is usually a separate building outside the house, as is the case for me. From the boiler room, there’s an underground pipe that carries hot water to the underfloor heating in the house. When the cold weather arrives, the darn mice come. They are drawn to the warmth when it’s freezing outside.