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.