I grow my orchids in a room with a window to the east. It's in house so I can't increase the humidity too much. So what I do is to water the plants daily when te RV is not that high (under the 60%) and when it's above 70%. I use a fine spray hose with a 3 liter bottle. I look at the plants if they are dry. This combined with a strong ventilator that moves the air four times a day for 2 hours gives me great rooting and many green growing tips (ofcourse also RO water and fresh potting medium).
In house growing of Bulbophyllum eg is not possible because the RV in general is too low. So I choose my species but most will do fine with this regime, from Vandacious to Pleurothaloids. Good luck!
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