Theoretically, 98 degrees or blood heat would seem to be the
temperature for setting, as rennet is the most active at this point.
Usually, 82 degrees in warm weather, and 86 degrees in cool weather,
are the points at which the rennet is added in setting. But there is no
reason for a different temperature at different seasons, except that
in cool weather the temperature is liable to run down a little--which
should not and would not be the case, if the make room were so
constructed that the temperature could be controlled and kept at summer
heat.