I sure hope everybody stays safe and all the critters do ok 

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hard to remember 100degrees F last summer, I will be moving back to MO this spring, my wife and I spent last summer in MO's heat, reminded me of TX
I lost a Welsummer to the heat last summer. My first lost to heat other than 2 chicks I let someone babysit for me and they got too hot.Last summer was a bad one.
I honestly don't know how I didn't loose any birds this last summer, it was brutal. I did use lots of electrolytes and frequent water changes throughout the day. I did loose a BR roo the summer before last to the heat, I think he had heart problems anyway as his comb was always an off color leaning towards purple, and he was only 6 months old.I lost a Welsummer to the heat last summer. My first lost to heat other than 2 chicks I let someone babysit for me and they got too hot.
Never lost a chicken to cold. That includes chicks that lost heat lamp power or those of all ages that ran into the woods and spent the night and returned in the morning unphased.
I had a couple batches of young chicks that lost power this winter, bldg was high 20s. They all pulled through just fine.
My youngest now are 3 weeks and have been in the unheated/uninsulated brood house with a single 250W lamp they are alread shunning so if I lose power I won't worry too much.
Nothing in the incubator luckily.