lots of moisture in the abundance of fresh air is how you do it...
the plants can take the heat if you provide them plenty of humidity and fresh air in constant motion...the plants leaves and sometimes the whole plants wiggle all the time from the air moving around them constantly.. if the same plant given the same high temps were to sit still, motionless with little air flow and relative low humidity, it would soon wilt.... a fine balance between watering and keeping them just moist enough to keep them cool in the heat without drowning them in so much water they start to struggle. its when they start to struggle that you have problems in any temp or environment. they do fine if they need a little water all the time. they dont do well if they seem to need a lot of water or get too much too often. Its a secret code