Don't use heated waterbeds or insulate them. Fix any leaky faucets or toilets. Consider purchasing a notebook PC rather than a desktop model. Notebooks don't use as much power. Install ceiling fans help cool you down.
Air movement created by a fan can make a room seem cooler by four degrees or more.
House plants add humidity to a house in the winter. This makes you feel warmer at a lower temperature. Add thermal mass to your house. Ceramic floor tile, brick partition walls and stone fireplaces help keep your indoor temperature constant. Put a plastic wrap on them during the winter.