If it ain't broke, don't fix it! lol
I live in a pretty dry climate - especially in summer where day time humidity is rarely even 30%, and it isn't unusual to have humidity in the teens or even single digits. Night time humidity is higher, but in summer that can be only 40 - 50%.
Winter humidity is higher but still daytime less than 50% usually, tho nights can be near 100%
I do not do anything special to increase humidity with exception of a few vandaceous types which get a spritz of water early in the day. For plants which don't want to dry out I do frequently add small amounts of water with a spray bottle to keep them moist in-between regular watering. In the summer that can be every day or two. Less this time of year.
It sounds as tho your orchids are doing well, so don't think there's a need to change things.
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