if you can keep the air moving with plenty of fresh co2 rich air coming in from outside, the plants will be ok in high temps, they will drink a great deal more to keep themselves cool, using A/C is not efficient it uses a lot of power to cool the air down, using water to cool the lights is more efficient in the long run but more involved and costly to first set up
i would personaly try using lower wattage lights first, and remove the hoods the metal reflectors act as heat radiators, maybe look at vertical growing
or even at least the glass tube cool reflectors you can attach the extractor to
also use a powerful extractor fan, the quicker you can remove all the air in the grow space and replace it with new air that is lower in temp and has more co2 the better,
i would get an 8 or 10 inch extractor fan, it will cost a fraction of the price of an a/c ,
the extractor will not reduce the temperature by as much as an a/c, but it will cause much more air flow, and bring in more co2 from outside,
a standard portable a/c has a small fan that moves only a small amount of air, compared to a large inline extractor fan
during veg they can handle very poor conditions, but once the buds come, they will get sick turn yellow and crispy the leaves will die quickly heat damage and lack of co2 when they get over 90f in poor air conditions
remember though plants will thrive in 90f if you can give them enough fresh air / co2 , food and keep the humidity under control, heat actually makes them grow faster
peace
cn
