This is the dumbest question ever. Since it's a worldwide question my guess is it's the victim of a bad translation.
I need heat to cook my food, it helps me stay warm in the winter and it's used to melt metals and plastics which can then be formed into useful objects. Heat is pretty nice.
On the other hand, cold can be used to keep food from going bad. It also keeps me from sweating my ass off in the summer and I like that it can turn liquids into solids. Cold is pretty nifty, too.
Arg.