Prepare for Guests
Before you start cooking, turn down your thermostat a degree or two. The extra heat from your oven will keep you nice and cozy. The same applies if you are expecting family to visit, since people generate heat, the space may become wastefully overheated.
Cook Faster with Lids
Use a "lids-on" approach for cooking. Tightly fitted lids on pots and pans help keep heat in, enabling you to lower the temperature settings and shorten the cooking times.
Clean Up
When all of the cooking is done, turn off your dishwasher's drying cycle and let your dishes air dry. It might take a bit longer, but if you run it at night before going to bed (when the use of electricity is lowest) you won't even notice the difference- but you might see a drop in your energy bill!