I lost a few chicks the first week and the guy at the feed store said that it sounded like pneumonia due to getting too cold at night. So I cranked up the heat and they seemed to do better, but a few times I was away for a whole day and left the heat lamp on because it was cold in the garage (where my brooder is) in the morning but then the temp got really hot 90's during the day. They were really lethargic, but then seemed to be ok the next day except one little one who still seems weak. I feel really guilty that I may have "cooked" them. I'm sure the temp was over 100What kind of long term damage have I done?