Lol I was recently in that position when the power went out. To actually heat your room would take an incredible amount of energy and power, you would have to be extremely advanced. Try heating yourself using yoga and meditations. I've started bringing the fire element to my skin, not quite invoking, and holding it there while I'm outside. There's also a heat meditation using your sushumna: http://www.angelfire.com/empire/serpent ... ation.html
Also, try doing a working to get a space heater or something!