I'm sick of the dander and smell in my garage, and I think my brooder is a little too small already for my 75 birds. They are two weeks old, and my plan is to put them into the 10x10 pen, with two heat lamps, covered entirely with a tarp. My thought is that between the two heat lamps and the tarp, it will probably stay at least as warm as the brooder in my unheated garage, which is only 14 inches tall and provides no insulation. It will have to be- we are going to have a high of 45 today, with a low of 29. Any thoughts? Hopefully some of the experienced broiler folk will weigh in on this soon. I'm going to hold off for a couple of hours before I just go for it! Thanks.