10:00PM. >> ANA BELAVAL: ALL RIGHT. THANK YOU, OK, CHICAGOANS LOOKING FOR ANY WAY THEY CAN BEAT THE RECORD. BREAKING HEAT. WGN'S JULIAN CREWS IS LIVE NOW WITH MORE ON THAT. HI, JULIAN. >> JULIAN CREWS: HEY, GUYS. WELL, AS YOU HEARD, ALYSSA SAY THIS EXCESSIVE HEAT WARNING LAST UNTIL 10 O'CLOCK TONIGHT. THIS AFTER 2 DAYS OF DANGEROUSLY HOT TEMPERATURES, THOSE WHO HAVE TO WORK OUTSIDE TAKING PRECAUTIONS. >> WE HAVE WONDERFUL WATERS, GATOR AID, EVERYTHING THAT WE FOR A HOT DAY LIKE TODAY, ORLANDO SALAS CAME PREPARED, KEEPING HIS CONSTRUCTION CREW AS COOL AS POSSIBLE IN JEFFERSON PARK. YOU TAKE A BREAK EVERY NOW AND THEN WE'RE COMING AROUND, OK? HE'S SO GIVES THAT FEW MINUTES IN BETWEEN SPOTS, THE BLAZING TEMPERATURES AND HEAT INDEX ON THE HOT CHICAGO PAVEMENT REACHING TRIPLE DIGITS. AND THAT'S WHEN THINGS GET BUSY DELL JOE HEATING AND COOLING BEFORE. ONE WE'RE SEEING ABOUT A 30% INCREASE IN CALL VOLUME FROM LAST WEEK. LUKE WIDENS SAYS THE BEST WAY TO AVOID HEAVY REPAIR COSTS IS TO REPLACE YOUR AIR CONDITIONING FILTER BEFORE THE UNIT BREAKS DOWN. WHEN YOUR AIR CONDITIONERS RUNNING. 24 HOURS A DAY, YOUR FILTERS WORKING 24 HOURS A PARTS CAN GO BAD AIR CONDITIONER. AND WITH PEOPLE WHO DON'T DRINK ENOUGH WATER A LOT OF TIMES WE DON'T REALIZE HOW MUCH WATER ACTUALLY EASY TO DAYS LIKE TODAY. AND IT'S VERY IF HYDRATED. >> JULIAN CREWS: DR JACOB STETTLER WITH ENDEAVOR HEALTH SYSTEM DOUBLE BOARD CERTIFIED IN BOTH EMERGENCY AND SPORTS MEDICINE FOR HIS CHICAGO MARATHON CLIENT STETTLER ADVISING THEM TO STAY INDOORS. THIS IS THE DAY YOU GO INSIDE. YOU GOING TO THE GYM. YOU RUN ON THE TREADMILL. YOU STAY OUT OF THIS HEAT. VISITORS FROM OUT OF TOWN ON THE MAGNIFICENT MILE ENJOYING THE COOL LATE BREEZE. >> JULIAN CREWS: BUT GETTING OUT EARLY BEFORE THE HEAT TURNS DANGEROUS WHEN THEY START TO ME. >> AND YOU KNOW, FACES GIVE A GREAT FRIEND JUST THEY DON'T WANT TO WALK ANYMORE. THAT'S WE GOT UMBRELLA STROLLER. >> JULIAN CREWS: AND THOSE OUT OF TOWN PARENTS WHO WE TALKED TO EARLY THIS MORNING MAKING SURE THAT THEY ARE DONE WITH THEIR ACTIVITIES EARLY BEFO