If you mean counting triplets as in how to write them then you write them as you would any normal triplet. A quaver triplet would be a crotchet and a crotchet triplet would be a minim (although crotchet triplets aren't used much)
Not more than 4 in a measure, hope this helps !!
Answer:
Well I remember back in the renaissance or Shakespearean era, around when the black plague started theaters weren't indoors but rather outdoors. If you go that far back I guess people weren't kept cool but you have to more specific.
An example of what the theatre looked like