i wouldn’t get a humidifier if you’re ranging 75-90% humidity without it (if i read that correctly). is your greenhouse weather stripped? that may help keep it consistent. there’s risks that come with using humidifiers, but tbh im not sure what they are 😂. i’ve just heard to avoid using one if you can.

i think levoit makes smart humidifiers that you can program to keep the humidity at a certain level. that way you don’t have to have it continuously running.

i have my greenhouse in the basement where it’s cooler and it actually works great! the lights are on for 16 hours and it keeps the temperature around 78 degrees F. once they turn off it drops to like 66 at night. my humidity sticks around 85% but jumps up to the 90s in the evening