As summertime arrives, it also brings the season of higher utility bills. To help manage energy costs, Alabama Power recommends adhering to the 20-degree rule. According to Anthony Cook of Alabama Power, this guideline suggests setting your thermostat to 80 degrees Fahrenheit when outdoor temperatures reach 100 degrees. This recommendation is based on industry standards for the optimal design and operation of most air conditioning systems. By following this rule, consumers can improve energy efficiency and potentially reduce their summer electricity bills.