I live in a hot and humid climate. (Thailand) I have four 10day old chicks which I hatched from my incubator. The temp in the day here is around 32-38c and at night around 25-28c. Do I need to keep them under a Lamp? I had them under a Lamp for the first few days but I think it was to hot so I stopped using it. How old do you think they should be before I let them live permanently outside? They are in the house for now.