A man pushes a stroller with groceries as flurries swirl around on Woodward Ave. in Detroit. Millions of Michigan residents have been asked to turn their thermostats down to conserve energy during the Polar Vortex.

A man pushes a stroller with groceries as flurries swirl around on Woodward Ave. in Detroit. Millions of Michigan residents have been asked to turn their thermostats down to conserve energy during the Polar Vortex.