My chicks are in their 4th week and up until now they've been in a box in our bathroom (and we kept the temp this week around 75 degrees) All day today, though, they've been out in the coop (with the door closed). Here in Michigan it was 60 degrees today, and it's going to be a low of 35 tonight. Obviously I'm not going to let it get down to 35 in the coop. I put a heater out there and set it to 75 degrees and I also added their heat lamp a couple feet over the floor. This doesn't garuntee that it'll be 75 in the coop, though, since there's fairly open eaves (for vents) and (like all coops) there's some cracks in misc. places. I look at the setup and think "whats the difference, really, between the heated coop and our bathroom"? Sure, the temp may drop into the 60s on a 30 degree night, but that should be ok at this point, right? I feel like there's 2 camps, usually...the "farm" people who say "Comeon! They're chickens, not babies...they'll be fine" and the "pet" people who have the opposite view/advice. I guess I'm looking for a real-world balance...what should the low-temp be for 4 week chicks with alot of their feathers in? I'm looking for everyone's advice on whether to keep them in the coop tonight or not... Whatta ya say?