We hatched chicks in early Dec. They were brooded in a far corner of our climate controlled basement, with a heat lamp and a draft shield (large piece of cardboard) to deflect the draft created by the ceiling HVAC vents. They had the heat lamp for maybe 1.5-2 weeks. I moved to a heat plate for the next 1-2 weeks. Overall, the heat plate was not effective for them early on - they were clearly not warmed enough by it when still fluffy and it was adjusted to a very low height. Once they had a good growth of feathers, the heat plate worked very well. Once they were around 3.5 weeks, it was clear they did not need the heat very much so I took the heat plate away during the day (when light was on in the basement and they were running around and I could frequently check on them and their warmth status) and then put it back in for the next 3-4 nights at a higher height setting. It was clear that they had acclimated and no longer needed heat by 4 weeks, as they were well feathered by then. Good Luck.