snakes that withstand cold

I was wondering if you guys know of any pet snakes that are able to handle low temperatures? I live in Europe, so always have a fear of a heat bulb going out while I'm away, and the snake suffering. I know garter snakes, and mandarin rat snakes can handle low temps, any others?

Diamond pythons are the most southerly dwelling pythons so i would assume they can deal with lower temperatures. I would also look at snakes native to more Northerner areas as well, just depends on what your looking for.