| Jay,
I posted some stuff for you in your thread about light so check there too. 40-60% humidity is probably ok for many orchids. You will probably need to avoid orchids that require high humidity, for exaple i'd stay away form Masdevallias and things like that. You may find that with the lower humidity you might need to water more. Watering frequency is somethign we all need ot figure out as each of our growing environments is slightly different.
If you haven't done it already you might want to consider different mix for different orchids; a moisture retentive mix for the Phals (bark, coir, etc., etc., wiht some sphagnum moss added) while staying with a drier mix (maybe just bark, charcoal and perilite) for the Catts.
Probably the best growing tip I know is to always ask lots of questions when buying orchids. Tell the grower your humidity range and ask if the orchid you're interested in can thrive in that.
Enjoy and ask lots of questions!
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