Hey mate,
You can pick up some co2 bags, they help with the heat a little, not massively but if it's only the odd occasion and isn't getting over 30° constantly you should be golden.
Alternatively you can get an AC unit for just over 100.. I've not got one myself but did look into it on amazon and some have pretty decent reviews.
Failing that increase your air exchange, as your tent will be hotter than the room it's in due to the lights.
If it's a permanent thing you may want to consider changing your light schedule to have the dark period during the hottest points. You can do this by changing you lights schedule by 15 minutes each day until you get to the desired time.
Hope this helps 🙂