We are new chicken owners (near New Orleans, LA), having had our now 9 wks old chicks since they were 5 days old. We've just moved them out to the new coop from the brooder on New Year's Day and they love it. Now that cold weather is here, though, I'm worried that, even though they're fully feathered, my girls might get too cold in the coop. We've closed it up but there are still vents all up around the top and two more triangle window/venta on the upper walls (I'm attaching a photo of the coop, which is still a work-in-progress). They have a ton of pine shavings in there and a 250 watt heat lamp. I'm wondering if the heat from that is just going out the vents! I just checked the temp and it's 39 degrees in that darned coop now at 11:30 p.m....it's bound to get colder in the wee hours, too. I also just went out and peeked in on them and they were all up on their roost and seemed fine. Do I need to put something over those vents when it's this cold out? I have a neighbor who's been raising chickens for 40 years (he has about 300 now), and he poo poos my concerns...says that if they have a roof and walls and no draft, they'll be fine in our louisiana winters. What do you say here?