Humidity questions

[CarterOllint]

Ok, so, my folks have just made a greenhouse, it's 10' by 10'. They're new to this, so am I, so as much advice as you can offer would be awesome, not only related to my question. They plan on growing tomatoes and eggplants if I'm not mistaken. Is there a humidity level they need to keep here? And if so, what are the best options to get the moisture to that specific point? I'd also be curious if a certain temperature is preferable for the growth of these plants too.

 

[daveomak]

Don't forget plants need CO2 to grow... vent it well so it's not all consumed and your plants quit growing...

 

[KillianMatters]

Greenhouses tend to be very humid. What you must aim for is a 50% to 70% relative humidity, but chances are that without a dehumidification system, levels go past the safe point. When it comes to temperature, as I know of, it depends on the crop you grow too. For tomatoes, 72F is more than ok, but this varies as I said, depending on what you grow exactly. You can find enough resources online to get informed on this topic and see what is the best environment for each crop. Of course, make sure to plant together what actually works, crops that are similar in demands of temperature and humidity, cause otherwise, some will flourish while others will likely die out. And yes, don't forget that proper ventilation is a must, not an option.
https://garden.lovetoknow.com/wiki/How_Does_a_Greenhouse_Work
https://www.optimainstitute.com/dehumidifiers/bathroom.html
https://ag.umass.edu/greenhouse-flo...-fertilizing-plants-growing-in-soilless-media