I found this paper whilst looking up the effects of heating on the human body:
Summary is that:
blood will flow up to 4x more than before
core and muscle temperature increased by around 3C
...all from heating ONE leg - and remember that Southeastern's heating exhausts over 60C typically.
My recommendation is that customers do NOT sit next to the windows on networker trains as this could cause adverse effects to health
Get the message out
Please share this post with your fellow commuters - delays are bad enough, however damaging your health and wellbeing due to Southeastern's continued negligence, and ignoring of the heating issue, shouldn't be something else to add to the list.