temperature setings for fix insert/*

First, of course, you need a fix of type heat/gran in your script like in the heatTransfer examples. This fix will create an internal fix with id 'Temp'.

Up to now you modified this Temp fix by using something like
set region halfbed property/atom Temp 800

Now you should be able to set this by adding to the list of arguments of your fix insert/* command something like
set_property Temp 800