One trick of cold rooms and frozen pipes - put a light bulb in there. In the (old) house that I'm in, there's a room that is for all practical purposes, under

One trick of cold rooms and frozen pipes - put a light bulb in there. In the (old) house that I'm in, there's a room that is for all practical purposes, under the garage. It is very poorly insulated and for some reason, some water pipes ran through it. On a cold winter, the pipes can freeze. So, there's a lightbulb in there that for several years kept the pipes from freezing. The pipes have since been rerouted. The next step up from just a lightbulb is to put a Y connector with two lightbulbs on it and screw a dusk to dawn sensor into one of the branches and then another lightbulb into that. This way, if the primary lightbulb burns out, the other one will turn on.