Hmmm.... You've all got me wondering about my coop design now. I have 5 standard girls, so the inside dimensions were going to be approx. 5' x 4.5'. The coop was going to be raised above the run, with the actual coop itself ranging from about 4' to 5.5' high (inside dimensions). Coop will be fully insulated (walls, floor ceiling) and wired for electricity. Window on south and west (with shutters), though will be in deep shade most of the time in winter, so probably won't have a lot of solar gain in the southern window. First concern I ran into was the ventilation given the interior height of the coop. Figured I didn't want them catching a draft while on the roost, so we're thinking of adding a cupola with vents that would be used more often than the vents near the roofline (obviously, will be able to open and close the vents to control air flow). I had planned on using a heat lamp, too, but now I'm not so sure after reading Smoky's post. But then again, since my coop is so small, is there a chance that the entire coop will be fairly evenly heated with that single heat lamp? Has anyone out there had success with a single heat lamp in a small coop like this? Hoping it will work and perhaps eliminate the health problems Smoky thought were assoc. with the larger temp variations. As far as the waterer, our is a 3 gal plastic hanging waterer. I was thinking of just aiming a regular light bulb down toward it on really cold days if I found freezing was an issue. Anyone had success with this? If you notice any potential problems with these ideas, please let me know! Thanks for sharing all of your great tips.