As you clean and organize your house, why not take the opportunity to conduct your own home energy audit (or hire a professional service to do it for you)?
According to the U.S. Department of Energy, sealing leaks around the house could potentially save you anywhere from 5 to 30 percent in energy costs. Check in places both big and small, from electrical outlets to window frames, baseboards to gaps around pipes. Don't avoid inspecting the basement and attic, too. Caulk and seal around plumbing and wiring leaks and gaps, and anywhere you feel a draft coming in around windows and doors.