The_420answered grow question 6y ago Hello
For humidity, you can put a dome over your plants to keep more moisture (you can use a plastic bottle cut in half, remove the cap so your plant gets air, and place it over your plants)
You can look for an air inducer; it will bring in cooler air into your grow box, but if it's also hot outside, it's better to consider an AC...
Good luck with your grow!