I put mine out at a week old and night time temps dip way below that. My day time temps aren't as high as yours either.So, the temperature varies greatly in the coop with the littles. It gets down to 70° at night and is 87° in there now. They lay under the lamp when they are sleeping and are running around the coop during the day, eating and drinking good. My question is, can the differences in the temps get them sick? That's quite a variance in the temp