A chick hatches unable to regulate its own body temperature, so the brooder is its hen for the first weeks — and like a hen, it should offer a warm place to return to rather than uniform heat everywhere. The numbers below are the standard starting framework, but they are a framework: the chicks' behaviour in your brooder, on your bedding, in your barn, always outranks the thermometer.
Week one: properly warm at the hot end
Set the warm end at chick height to roughly the low-to-mid nineties Fahrenheit before the chicks arrive, and let the far end sit much cooler. Newly arrived chicks spend most of their time sleeping under the heat, venturing out to eat and drink, and dashing back — that shuttle is normal and healthy.
A tight pile directly under the lamp, cheeping loudly and continuously, means cold even if the thermometer disagrees — check for a draught at floor level, a lamp that has drifted too high, or a room that cools sharply overnight. Chicks scattered to the far corners, wings held out, beaks open and panting, are too hot, which in the first week usually means the lamp is too low or the brooder is small enough that the cool end is not cool.
The weekly step-down
Reduce the heat by about five degrees each week, raising the lamp a little or adjusting a heat plate's setting, until the brooder sits near ordinary room temperature.
Make each reduction small and watch the next bedtime: chicks that settle in a loose, quiet group under the warmth have accepted the change, while a return to the tight, noisy pile says you moved a week too fast. Step down in the morning rather than the evening so you can observe the reaction during the day instead of discovering a chilled pile at dawn.
Nights, outages, and warm rooms
Night is when brooders fail their chicks. Rooms cool, lamps get knocked by curious cats, and bulbs choose the small hours to die. A backup bulb, a securely double-fastened lamp fitting, and a late-evening check are worth more than any refinement of the daytime setup. Know what you will do if the power goes: chicks can be gathered into a small lined box in the warmest room of the house to hold heat together until the brooder is back.
The opposite problem arrives with a warm spell: a brooder set perfectly on a cool morning can overheat by a sunny afternoon, especially in a small room or under a roof that collects sun. Ventilate the room, check behaviour at midday during warm weather, and never assume yesterday's lamp height is right for today's weather.
Reading chicks instead of just numbers
Weigh behaviour as heavily as degrees. Eating, drinking, exploring chicks that sleep in small scattered groups are comfortable at almost any reading. A chick standing alone, eyes closing, not joining the others at fresh feed, is telling you something a thermometer cannot — pick it up, feel whether it is warm, check its vent is clean and its crop is filling, and warm a chilled chick gently in your hands before returning it to the heat.
Keep a simple written record of each adjustment and what the chicks did in response. A week later, that record is the difference between repeating a mistake and knowing your particular brooder runs hot at the lamp's left side.
Temperature changes go wrong when different carers adjust from different assumptions, and KinsLe Care Teams helps by letting each person checking your chicks log the reading, the lamp change, and how the brood settled, all against the same shared list of duties.