My two (at my house) only have their own generated heat in their bathroom. It gets pretty warm in there at times, so I turn on the fan to draw in some cooler air under the door (and freshen the room) and they are doing fine. The LB was purchased March 1st, and the Dominque from WaLady is a week older I think. I can't wait to get the pen finished so I can move them outside.Surprised...my 20 day old chicks were off heat for over 9 hours today in the house. My house is at 68 degrees and they were fine for 7 hours straight without the lamp, then another 2 hours later this evening! That's great! Heat lamps cost a darn fortune to run! My goal is to have them off daytime heat entirely by 4 weeks, and out of my darn house making a dusty filthy mess by 5 weeks with only heat at night out there too.