I live in southeast Texas and it is hot here also, so to avoid shock from cool temperature to the hot tempature once all my chicks hatch i put them outside in my greenhouse that doubles for a brooder on one side,i have a door that i open up for them to go outside in a penned area in the daytime and at night they go back in, with a heat lamp on the far end, they never sleep under it, but it's there if they need it.
I also bury frozen water bottles in the outside run to keep them cool along with a fan.
Looks like you are going to have a great variety
I also bury frozen water bottles in the outside run to keep them cool along with a fan.

Looks like you are going to have a great variety