Typically ~40%. But the “roots” are in 1/4" orchard bark that is soaked (immersed) once a week for an hour then drained.
I have small 1400 sq.ft. home with central A/C and heating although room to room it can vary by a few degrees. Year-round that room stays between 65°F and 78°F. It is east facing.
I have posted a link elsewhere on this site to an orchid guide I wrote awhile back but it needs a few updates. Please send me a round-to-it or two so I can get that done.
In the meantime here’s an update on this orchid – the quantity of blooms is about to double.