By Stephanie Hemphill,  Minnesota Public Radio 

In many parts of the country, this summer was one of the hottest in history. The Twin Cities tied a record stretch of 39 days at or above 80 degrees.

A lot of us have been running our air conditioners non-stop.

Five percent of all the electricity used in the U.S. goes to cool our homes.

And climate scientists say we can expect more hot summers. Which raises a question: How much does the energy we use for air conditioning contribute to global warming?

Near White Bear Lake, Kurt Feagler is replacing an air conditioning system in an older house. His company, Bonfe’s, has had a lot of work this summer.

Read the full story here.