This is only our first summer, so I can't say each year, but I probably will, once we log that much experience. Since I shared my last heat experience, we have built a bigger run outside the nice shady coop, with a tree inside. Since it was built we have had three weeks with 5 days in a row of over 100 degree temps., even 105 and 106. I have one triangle of the pentagon roof permanently covered with a tarp for additional shade, and since I put it up we have needed the shade tarp to wrap around two sides of the run, too. In 3 weeks I have only taken the tarps of the sides one day. In addition, I have black shade cloth across the other side of the roof, so only the middle part with the tree is open to sun. They are attached with bungee cords so they don't blow off. I give them their grower crumbles early in the morning with cool water. By noon it's very hot and dry and they won't drink the warm water anymore, so I wet the shade cloth and the foliage of the tree for evaporative cooling. I hose down the patio which is adjacent to the coop to cool it. The water only wets the run area, not the deep shade area under the coop. They run in there when I spray, but enjoy scratching in the damp soil/bark when the water stops.  I have tried giving them electrolytes or ice water in their waterers, but they won't drink it. They like to rub up against the cold bottle though. The best solution to get them to keep drinking during the day is to put a shallow pie plate of crushed ice with an inch water in it inside the deep shade area. Keep in mind, the ice melts very quickly at these temps, so there is no danger of choking. If there are extra cherry tomatoes in the garden, or zucchini's that got too big, or herbs like basil or thyme I throw them in there to give them more drinking options. They always eat all the veg and herbs out (leaving the zucchini skins), and then they like to jump in and cool their feet. After this, they seem well hydrated in the afternoons. The yard begins to cool dramatically about 4:00pm when the shadow of the house shades most of the yard. Only 4 chickens, about 11 weeks old. I refill any empty waterers with cool water. Withy this routine, early feeding and  watering, water check mid-day, and putting them to bed in their closed coop just before dark, they have managed the heat very well.