Maricopa County has opened more than 250 heat relief sites across the county to help anyone in the community beat the heat. The county has more than 250 heat relief sites open. We all experience heat," said Kelli Donley Williams with the Maricopa County Department of Public Health. ‘It is crucial’That is why the county has more than 250 heat relief sites across the Valley for anyone in need. What you can do:Anyone who needs a ride to one of the county's heat relief centers can call 211.