Hi, I'm a first time chick mom. I just took my 3week old chicks outside (in an enclosed pen) and they loved it!!! We are in Pa. and the temp is high 80's-90's during the day. What is best for the girls; outside pen w/ shade OR inside the house in the A/C with their heat lamp. I don't want to take them out too soon. But if the temp works... thanks for the help!