How can i rise the air humidity ??

basically there's only one way to increase humidity to 50% without huge extra cost. you want to think of your air system in a way to see the air flows in and out right? then find your air intake. If it's high up in your space, you might want to move it down so it's easier. Basically you want your intake air to come into contact with some water on the way in. the bigger the surface area of the water the better for the humidity. For example i have a fan hitting a large tray of water (in a good way - it shouldn't get everywhere!) before my intake so it's not on the inside of the tent. This is the only way without getting a humidifier. Even then, better than a humidifier is a system to combine airflow and humidity but that's pro tools, and it basically does the same thing as described here. Atmosphere is tough ! even now after all this work I get temperature differences inside the tent 😅😭 🚀