I am using the mhp for my new chicks, in the garage for a couple weeks than outside in a prefab coop inside the chicken run. These chicks love it! I love it! I have no idea why everyone isn't using this. You are my hero

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Yep, I’ve hatched eggs here when early springtime temps are still dropping into the teens and twenties. That happens despite much of the the rest of the country enjoying more acceptable “chick season temps”. We can - and have - had snow here in June. All chicks get a couple of days indoors under Mama Heating Pad and then out they go. I want to make sure they are eating, drinking, and know how to use Mama Heating Pad to warm up. I don’t handle raising home-hatched chicks any differently than feed store or shipped chicks. Once the chicks are using Mama Heating Pad and aren’t showing shipping or hatching stress I put them outside under the outdoor Mama Heating Pad, set up and warmed and waiting for them in the outside brooder. Since they use it indoors, they automatically find it and transition right to it in the new setup. Sometimes I have to show them where it is when they first go out by tucking them under it hand holding my hand in front of it, but that only takes once. Even more remarkable, the chicks I hatched out here at home were Silkies - supposedly so delicate anyway
My friend @Ridgerunner raises all of his chicks outdoors from the start as well but he uses a heat lamp setup. It’s worked beautifully for him for years. He was raising incubator hatched chicks outdoors well before I was, with great success, so that’s another avenue you might explore. He has a lot of posts showing his setup.
Nobody puts chicks wet from hatching out there (except non-calendar-reading broodie hens) so once hatched they would spend at least a few days in an indoor brooder. You’d want to keep an eye on them for any hatching stress or issues anyway.
I hope this answers your questions.