As the heat goes up this summer, so do cooling costs

• Average air conditioning costs in the US could reach a 10-year high this summer due to extreme heat.
• Heat waves now happen six times a year on average, up from twice a year during the 1960s.
• Advocates are calling for more funding to help low-income residents with their energy bills. 

Many Americans are cranking up the air conditioning this summer to cope with scorching temperatures. And it's costing them.