What is a good humidity for autos in flower?

well, it's a bit early to say. And there are two answers to that question. First answer is that most growers try to keep the humidity during flower low so that there is less risk of bud rot, that's why you see growers trying to keep it under 50%. However the metabolism of the plant is regulated by VPD. Therefore you want the correct VPD range so the plant grows optimally. The good news is there is a cool company that has made a compromise between keeping humidity low during flower and having the correct VPD range. So the correct humidity depends on the temperature, for temperature between 18 to 20 you want to keep humidity between 30 to 42%. For temperature between 25 to 26 you want to keep humidity between 48-60%. It's complicated but it's correct. hope this helps ! 🚀