Hey!
A smooth operation is run from 20-28C
Depending on what cycle your in..
In veg you can aim for 20-28C while in flower aim for 18-26
Day time being the hottest and night time the coolest.
I like to aim for 26 daytime and no lower than 20 night time, thought out the whole process.
That gives it a stable environment and the 5-6 degrees cooler at night to help them absorb the nutrients better and grow faster.
Good luck and happy growing!