That white plastic thing hanging at the top of the coop is a ACU-RITE for temp. tells me what the temp is inside & outside along with humidity. Seems to work good, I get nervous and have to getup put my glasses on to check their temp then I can go back to sleep knowing their ok. I know I shouldn't worry about them but the wind is awful off the water front, animals can't get away from wind and it's a killer so that's why I check...so far so good, never went below 37 in there and they do have nest boxes only you don't see them in the picture I sent only one side of the coop.