Honestly, how many times do pet owners need to be reminded about the dangers of leaving their friends unattended in cars? It's not only shameful but down right criminal to think your pet has a chance of surviving in an unattended car even with the air conditioning running.
Temperatures in a car rise to over 100 degrees in a matter of minutes and if the temperature hits 120 your pet suffers an unimaginable death. Since the heat wave hit Sioux Falls, local Animal Control Officers have rescued pets from cars parked on asphalt driveways. Their survival is attributed to, thankfully, bystanders who noticed the danger and called authorities.
Heat tips from the Humane Society of the United States: Limit exercise especially in hot and humid weather where your dog or cat has a problem panting to evaporate moisture. Fans aren't going to do the job alone, your pet needs air conditioning, more than you do. If your pet is outside provide a never ending supply of water (chip in some ice once and awhile) and lots of shade.
Should the unthinkable happen and your pet suffers heatstroke, get them to air conditioning quickly, apply ice packs to their head, neck and chest. Run cool water over them and get to your veterinarian.
And if you house loses power and you need to find A-C somewhere else, of course take your family friend with you.