You don't want the whole brooder at 102! Having the ability to cool off is just as important as being able to warm under a lamp. So, heat one area and let the rest be ambient temp. If you think about it, mama hen doesn't heat the air around her and it's normal for the chicks to leave her side, scratch and peck and explore, and then return to rest where it's warm.
BTW, thermometers measure air temp. If you're using an infrared lamp, it's pretty much impossible to accurately gauge the effect with a thermometer. Instead, watch the chicks. Cuddled under the lamp to sleep and active at other times is perfect. Incessant cheeping and piling is cold. Panting and avoiding the lamp is too hot.
BTW, thermometers measure air temp. If you're using an infrared lamp, it's pretty much impossible to accurately gauge the effect with a thermometer. Instead, watch the chicks. Cuddled under the lamp to sleep and active at other times is perfect. Incessant cheeping and piling is cold. Panting and avoiding the lamp is too hot.
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