Don't try to beat the heat. Ride in the heat and adapt to it. You'll be a stronger rider for it. Wear the right clothes and drink lots of water. Monitor your HR. If it goes way up and doesn't come down when you stop, sit in the shade and drink water until it does. Pee every 3 hours. If you can't, stop and drink until you pee, then go on. Use electrolytes, for me 1-2 Endurolytes per bottle.