Welcome to BYC. Where do you live? Here in North Texas it has been extremely hot! You should make sure there is always shade. Even something like a temporary tarp type shelter in their run. It doesn't have to been very tall. Just something they can get under for shade. In the mornings, I wet down the areas they like to lay around on in the heat of the day. I freeze water bottles & put one inside the waterer mid day. I freeze a jug of water & place it in front of a small fan pointed towards them. A friend of mine just puts the frozen jug in the run & the chickens stand around it or lay on the cooler ground nearby due to condensation. At the end of the day, I just hose off the jug & place in a clean plastic bag & place back in the freezer for the next day. They don't eat much in the heat of the day but if I pour some cool water on their feed they will eat some. They act like its a great treat. However, don't do too much at a time. What they don't eat should be thrown out at the end of the day. Chickens shouldn't eat old wet or molded feed. The most important thing is fresh clean cool water. Water is how chickens cool themselves. The panting & wings lifted away from their bodies is normal when they are hot. Sounds like your doing a good job. Use the search to find articles related & search forums for others discussing this topic.