Sour Diesel (RoyalQueenSeeds) First photoperiodic grow

Week 2 of the growing phase, I got the asparagus under control and also dug them further into the new 3.5 litre pot. It's actually developing really well and doesn't smell at all yet. On day 13 I unfortunately noticed that the leaves had curled up a bit, I suspect that this is due to heat stress as I have temperatures between 28 & 31°C during the day. I try to counteract this by opening all the windows at night and lowering the temperature as low as possible. Do any of you have any other tips or know if there is another reason for the curled leaves? - Zhyrax