Well I don't know if you want to hear my answer to that, but here goes. My chicks are 17 days old. I brooded them in the house, first 3 days they had heat light at about 93 degrees on the warm side of the brooder cool side was around 75, next 3 days or so heat light was moved up and warm side was about 85 cool side 70ish, at about one week old no heat in the day small wattage light at night, most of the sunny days spent outside, at about 2 weeks just a few days ago they went to a brooder still inside a structure buy outside of house (no heat light at all), still spending days in the enclosed covered run outside, this coming Monday they will be almost 3 weeks they are moving to the coop full time (my coop has an area in it for chicks so they are in the coop w/ the big girls but in their own section seperated by fence, w/ their own covered run) I also have a fake hen in the brooder which is about 10 or 15 feather dusters grouped together and suspended in the brooder for them to get under and snuggle w/ they (the chicks) generate tons of heat and all snuggled in the feathers they stay nice and toasty warm.