I hope that it has not gotten to cold where you live. I have started winterizing my home and I have a few tips to help you! They can help save money as well.
Windows-chalk and either put plastic in the inside or get the curtains that have the plastic backing to keep the house warm
Outside air units cover to keep cold air from coming inside the house
Doors- put the foam around the door to keep cold air from coming in
Cover pipes and your hot water heater to save money and to keep pipes from bursting