What orchid would like these growing conditions?

[smartie2000]

Masdevallias come to mind first thing. Choose the not as cool growing ones like masd. infracta and its hybrids.

[Ron-NY]

most orchids and other plants need air circulation. You might need to add a muffin fan to your tank. There are some small sized Bulbophyllums that would fit your need such as lasiochillum. What your post failed to mention though is the light level in the vivarium.