All these people talking about mould and freezing pipes, and so on, and I as an Aussie am deciding I'm totally out of my depth. An observation; We get only a few days of snow in winter every year. Our pipes don't freeze, our houses don't get mould from this. If you aren't in a cold enough to freeze the pipes type place, perhaps do what Aussies do and heat only one room in the house, it's fine.