My chicks (13of them) are 2 weeks old, i have a 3'x4' by 3' tall wooden box boarder for them. Can I move them outside in it. The boarder will be in a covered area that is fenced in with a heat lamp 250W bulb. The temp here are 60 daytime 46-50 at night. It makes me nervous leaving the headlamp on in my house when I'm gone 13 hour days at work.