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So our garage is insulated up to a point. We have been opening the roll up door while the sun was still out. We live in Texas so when it gets down to 40 that’s freezing to us lol. I just wanted to make sure these little ones aren’t going to be too cold. Do you think I should try to run that heating plate out there? I was going to put them in one or two of the smaller starter coops we have our in the chicken yard. And leave the big girls in their larger open air type coop. We have two of these: https://www.tractorsupply.com/tsc/product/innovation-pet-chicken-homestead-coop-222-87Looks pretty good to me, provided that they've had some exposure to temperatures similar to outside already (most garages aren't well insulated and would fit that criteria, but just making sure there wasn't additional heating inside garage), and that you have a draft free coop for them to use. I raised chicks outdoors from 2 days old with a heating pad in those temps without issue.
How many weeks should I wait before I openly mix them with the grown girls? After I put them in the little coops outside they will be in the same yard as the rest of the girls, so they will be able to see each other but not get to each other. The existing flock Consists of 4 hens, one of which I think is sterile (I’m only calling her a hen because she is about 8 or 9 months old) 6 pullets who most should be laying within a month or two and one rooster. The little ones are all 5 weeks old. 14 pullets, one roo and one extra mystery from the hatchery. All different breeds we wanted, same as the existing flock.If they already aren't using the heat plate much I doubt they'll need it outside. If it helps you sleep better then you can offer them the option of using the heat plate for a few days to let them adjust, then take it away. But I had my heat pad turned off at week 4.
And at what point can I mix them with the grown girls?
Depends on your set up and how you were planning to manage integration. I do early integration (https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/ - my own set up is linked in 2nd paragraph). As I brooded outside my chicks and hens had very early exposure to one another and time for them to get used to seeing each other. The chicks started mingling with adults at 2 1/2 weeks and pretty much spent all day with them from 3 weeks on. The idea behind this is adults are less likely to view small chicks as rivals/intruders and their small size lets them escape into hiding spots that adults can't reach.
If early integration isn't a possibility for you due to set up, you'll likely need to wait until chicks are older and large enough to be able to stand up to the adults without getting clobbered.
Photos of your set up would help.