It's not going to get any cooler as we head into summer.

Many of us get to stay inside, but first responders have to bear the heat.

Channel 5 News’ Sarah Cervera and Chief Photojournalist Mark Vecchio rode along with members of the Pharr Fire Department to see how they keep themselves safe while responding to 9-1-1 calls. 

One firefighter said responding to emergencies during a heat advisory can be overwhelming

“Dehydration, excessive sweating, fatigue, a little bit of muscle spasms that's what we started noticing,” Carlos Marquez said. 

It can get as hot as 1,200 degrees Fahrenheit in a burning home. 

As temperatures rise outside, firefighters undergo heat safety trainings.

“It's a refresher on what signs to look out for… maybe you notice one of your coworkers feeling nauseated — they are feeling dizzy, heavily sweating,” Jacob Moran, acting lieutenant and engineer with the Pharr Fire Department said. “In situations where it is an extremely hot day, we may have them rotate once in a structure fire and come out and get rehab."

Watch the video above for the full story.