Electric bills in Arizona can fluctuate drastically from winter to summer, with the higher temperatures increasing the use of air conditioners or swamp coolers. More people also means more electricity for more hot water, lights, cooking, and other appliance usage. Just one extra body creates more heat, opens more doors, and takes more showers. Another possible drain on electricity, which you would need to have a licensed electrician or other contractor verify, is aging or faulty appliances.