I really need to make my brooding much easier! If I purchased this unit: https://www.gqfmfg.com/store/comersus_viewItem.asp?idProduct=63 I think it would make life easier for me. I am in the process of looking for a used one (not much hope of finding it). From what I understand, there is only a heater on the top brooders, The grow out pens do not have heaters. Would there be enough heat given off of the top brooder to keep the chicks warm?