Chicks under a heat lamp will also suffer when there is a power failure and the younger the chicks
, the more at risk they will be. Having a bigger hen in the coop with the chicks can sometimes help as the chicks will naturally generate towards her and shelter under their feathers but chicks lose heat extremely quickly and will become drowsy and still when they become too cold. If power is resumed you can place very young chicks back in the incubator to warm them up before placing them back under the heat lamp