My little chicks are running out of space in the brooder pen. I am going to start building today on their coop and will hopefully have it finished by tomorrow at the latest, and I really need to go ahead move them when it's done. My question is would they be able to stay in it overnight. I live north central Texas and temps have been in the lower to upper 90's during the day. Then they drop down to the lower 70's at night (at least right now). I won't have electricity in the coop and wouldn't be able to run a light at night. Would residual heat from during the day be enough for them to be okay? I am just really concerned because of the lack of space, and they are flapping around, etc. I don't want them hurting themselves or each other. Thank you in advance!