Turn off incandescent lights

Only 5% of the energy that goes into a typical incandescent bulb comes out as light. The remaining 95% comes out as heat! Switch to compact fluorescents- they give off 90% less heat, as well as using 75% less energy. Initially more expensive, they are actually much less expensive than incandescents in the long run because they use less energy and last up to 10 times longer.