My greenhouse collection consists of phals, catts, oncids/intergenics and I keep it about 75%rh. It seems that the higher the temp they want higher rh. I keep it about 62 at night, in the morning go to 65, then to 76 in the afternoon, early evening/sundown back down to low 70's, then down to 62. Sometimes at night the rh goes as high as 85% if I watered that morning, but I have 2 fans always on low moving the air. So far so good, lots of growth and phals in spike now. This is a new regimen for me and I'm still a bit nervous about it. We'll see...
Remo