When the indoor temperature drops below a certain value, my heating comes on automatically. When it rises above a certain value, it switches itself off, again automatically. It does this whether I'm there or not - that's what's meant by "automatically". It's called a - wait for it, pop pickers - thermostat. Doesn't cost me anything a month.
Isn't there a free service (okay, maybe there is a small call/internet usage charge if outside your allowance) that comes with a smart meter? I have a friend who controls his lights etc via his phone and I can't imagine he'd pay anything as he is so careful with his money.
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