When to put young chicks with older chickens?

[poniesforever]

I have 17 chickens who are 3 months old, and they are out in the coop, and actually I have recently been allowing them to roam outside of their fenced in yard. All has been going well. I also have 18 chicks who are two weeks old, they are feathering nicely, even flying about some. They are in a brooder in the house. and I'm having trouble keeping the temp down in the room they are in. It goes over 90 daily, and sometimes over 100, I haven't been using the heat lamp for days, and it only has a 100 watt bulb in it. I'm wondering how soon can I put them in the coop with the other 3 month old chicks?Its been so hot lately. and even at night, in the house is often terribly warm/hot. We have an A/C only in the bedroom and only use it at night. If the older chicks weren't out in the coop, I know they would be fine out there... I just don't know when to put young ones with the older ones.

Thank you for your help!

 

[7L Farm]

I would wait till there all about the same size.

 

[poniesforever]

Okay. Thanks for your help. Must be that the bigger ones will pick on the smaller ones. I will have to fix up some sort of different set-up for the small chicks out in my horse barn. The house is just to hot. And their running outta room anyway. Thank You!