Hot Weather....
My birds are confined with no great deep shade for last half of the day so I have to be vigilant during heat waves.
I do have shade cloths up on run, which helps, but still not deep shade.

To help cool down the coop I have a box fan in the east window of coop, where it's shady most the day, and turn it on late afternoon...blows cooler air into coop and pushes hot air out. https://www.backyardchickens.com/articles/window-fan-mount.75608/

To determine heat stress levels I go by activity level, if panting and wing holding seems extreme, I throw out a few treats to see if everyone is moving well.
Lethargy is a red flag.

Deep all day shade is best but....I don't have much of that.
This has worked very well to keep heat stress/stroke at bay:

I give a dose of Sav-A-Chick electrolytes/vitamins about once a week during heat waves.
It really seems to help....started this after they saved a heat stroked hen once.
Can mix up a smaller amount, just wrap the packet tight and store in a dry cool place.
Always have plain water available too.

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BIG(9x14x2") chunks of ice last all day for wading, sitting, and sipping.
Shown is a plastic sled, any shallow sturdy tray will work, needs to not tip when they stand on the edge.
Tray should be washed off daily, I just squirt them off with a garden hose.
Much more useful to the chickens than frozen foods and treats.
Used to add water but they would gorge on too much too fast, I have seen a chicken suffer from an 'ice cream headache'.
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Make space in your freezer!
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Cold Weather....
Extreme cold temps can interfere with hydration too.
If a bird is not dehydrated, they won't eat well...it can go downhill fast.
I watch for lethargy, toss some treats out in coop or run and watch behaviors.
Any bird that doesn't go for treats needs some attention.

I mix a batch of SAC solution, then soak it up in some rolled oats, to avoid any wattle dippage of an open waterer.
Takes a couple hours to get it all soaked up, but well worth the time.
Soaked oats are then arranged around the edge of a large (14"dia) pan, they can all nibble from the edge.

Have done this every few days during extreme cold(<10°F), and I believe it's really helped them, they all stayed mobile.
Gives me a good chance to assess mobility, any bird that doesn't go for the oats gets watched very carefully,
and may be brought to a warmer place for a couple hours to 'reset'.

@BantyChooks taught me about 'cold reset'. I bring bird into the slightly warmer garage for just a couple-few hours. Makes sure she eats, give her a dose of electrolytes, see what's coming out the other end, and just observe. Then take them back out to coop, has 'saved' a few here, it's pretty amazing how they bounce back.
Tho I haven't had to do this since preemptively dosing with the soaked oats.

Top of waterer just set in the pan to keep them from walking thru it.
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