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Agreed that in Texas, particularly this year, heat is flat deadly!
Do you have other birds?
I'd also check them thoroughly for mites and lice - it's going around bad this year and that will kill a bird very quickly. Look at night and during the day. Most particularly look all through their feathers under their wings, at the back of their necks, around their vent, warm moist places. Use a flashlight to see better, ruffle their feathers over a white sheet or pillow case (or some light color).
If you find something, treat with permethrins in the coop and on the bird then you can follow up with DE if you want, but it must be treated immediately with something to quick-knock them down.
Otherwise, if you offer electrolytes, be sure to offer both plain water and electrolyte water in the same amount of water that you usually offer just plain.
Use multiple drinking stations so that the birds have more availability of water.
Let us know about how you prevent heat exhaustion and we'll help there.
Also, let us know if it's been rainy up there (dry as heck down here), or if your birds have access to a compost heap, any decaying vegetation, kitchen scraps, maggots (which love moist places), lots of earthworms, etc.
Also, what does their weight feel like? Are their keel bones sharp? Do you worm twice or more a year?
What are you feeding them? Can you answer the questions on the second sticky post in this forum only answer them here please? That way we'll get a more clear picture of your flock history. The more info we have, the better we do at helping you.
I'm very sorry for your losses and do hope we can help.