June and July are weighing heavy on my mind. So far it's working out pretty well. The garage doesn't start heating up until about 3 pm. That's when I fire up the swamp cooler. I have been able to keep the tent in the 80's and the humidity over 50%. My 6' tube fan sucking cooler air off of the floor is doing some good. Running the lights at night when it's cooler helps. Still this is uncharted territory, I haven't tried a complete grow in the garage during the summer. So far the plants are oblivious to the drama happening around them. When I hit mid 80's with 60% RH they grow crazy fast.
In a perfect world I would start them in the 80 60 range and the gradually lower the temp and humidity into the 70 40 range to flower. Wish someone would come up with a climate control device to do just that. And it needs to cost less than a couple of hundred dollars.