A "scientific" question/discussion about temperatures

[Jeff9]

I grow oxyglossums and some other plants that need 13C at night to survive.

Now i once read/heard that if you have 100% humidity and very good air movement at night that you can keep your temperatures higher.
Or maybe the fact that 100% humidity and good air movement keeps your temperatures lower.

Does anyone know how this works?

I have a basement where it is 16-17,5C at night. I want to grow my plants there but they need to be 13,4~C at night to do well.
Will i get away with it if i have high air circulation and high humidity at 16,5C ambient?

The humidity in my basement is 70%~, i had been thinking to further attempt to cool down by making a small evaporative cooler. However, with 70% humidity and 16,5 ambient, will it work?

Thanks