The official start of summer is just days away. As the temperatures rise, Peggy Layton is already bracing for higher energy bills."Normally, I never exceed $200, and it was close to $400," Layton said about her most recent utility bill.So where should you set your thermostat?For summer savings, the U.S. Department of Energy recommends an indoor temperature of 75 to 78 degrees during the day and increasing the temperature by 7 degrees when no one…