Warmth from Another World

I slept for three years. The world is gone, and I have the ability to sense temperature - nicknamed air conditioner. It was worse than me when I was a kid. My middle finger glowed with my special ability and could only be used as a light bulb. Constant temperature brothers, never cold or cool. We watch when others fight, and we run when others fight tooth and nail. As I ran, I realized that I had seen the world three years later somewhere before. That's not a dream.