First time chick owner here. They are four weeks old tomorrow. We have had a stretch of 90 degree days and so I moved their chicken brooder pen out to the coop (which has a window but it 100% closed off- dimensions are about 6x8 and 5 birds). For the last 2 days I have taken the pen away and given them the run of the coop but the brooder is still set up inside. It got cold last night. Temp in the coop this am was 60 and their feet felt cool. Yet none of them were under the brooder. Are they smart enough to go under the brooder if they are cold? Is the rest of the coop just too interesting that they don’t care? (Ps-I plugged in a heat bulb in place of the light bulb now to get the temp a little higher in the whole coop)