 When we show up to do a furnace, well, guess what? Usually the furnace is still there. Sure. So we have to unhook, disconnect, take loose, cut loose all the things that make the furnace work, from the ductwork to, in this case, the fuel oil lines and the venting and the power and the thermostat and all this fun stuff. In this case, they also have an old wood stove that's sitting next to the oil furnace tied together.