What exactly does "cool intermediate" means in cultivation outside of natural habitat

[PuiPuiMolcar]

After a few reading around the web, I find that most of the common technique for those who live in intermediate climate like mine is to have a drop in temperature at night if my days are hot. Ultimately my main question is probably how much am I able to get away with the night/day temp differences, if I were to keep my cool growers mild enough not too cold or too hot year round I plan to keep my grow tent for the cooler orchids but I have no control over night temperature. I plan to keep species like cuthbertsonii, smaller draculas, lepanthes, and rhynchostele.

I know orchids environment varies from genus to genus but I can't understand what difference does that make once they are placed under our care and our attempt to get around their natural habitat. We dont have 100% fog through out the day or 24/7 of fresh running water to exchange oxygen to the root unless you have a very controlled set up. My outdoor can provide the night/day differences but it is too dry for me to keep them hydrated, and I'm afraid that bud will blast if the grow tent is too warm and humid. Growing orchids sometime feels like I'm trying to keep them alive enough until I can get them through the bad season just to hope that they'll do well enough in the good season to weather the next bad season.