WCAU June 27, 2018 6:08 am Prep Your Air Conditioner for Summer's 1st Heat Wave With the summer’s first heat wave imminent it is important to check up on air conditioners to make sure they are in perfect working order. US & World Videos 0:51 Police officer shot and killed 1 of 4 dogs that attacked a 53-year-old man 1:49 ‘We have to do better': Philly teen dedicates her Instagram to humanizing victims of gun violence 1:22 Video shows man walk up to ring doorbell with an apparent gun, police say 2:27 76ers team owners bought tickets to pack the Wells Fargo Center with Sixers fans 1:28 Neumann University students help Delco law enforcement to investigate crime cases