My babies are no where near three weeks old but I like to think ahead, so here goes. I was looking to put my chicks in their coop at about 3 weeks of age with a heat lamp to get them out of the house. I live in Mass and our average daily lows for May is 50 ( this would be at night). I have six chicks and an 8x4 coop. I could either put them in the coop in a large box to cut off some of the coop or I could put them directly in the coop on pine shavings. I do not have power in the coop so I would need to run an outdoor cord to the coop. I have hardware cloth over my windows, so I would crack the window and put the cord through the hole in e hardware cloth. I would hang the lamp from a chain on the ceiling. Thoughts?