Our first response to encountering hotter or colder condition is voluntary - if too hot, we may
decide to take some clothes off, or to move into the shade; if too cold, we put extra clothes on - or
turn the heating up! It is only when these responses are not enough that the thermoregulatory
centre is stimulated. This is part of the autonomic nervous system, so the various responses are
all involuntary.
When we get too hot, the heat loss centre in the hypothalamus is stimulated; when we get too cold,
it is the heat conservation centre of the hypothalamus which is stimulated.