Welcome to the Orchid Board 8012294452365498027321 (ha)!
I know you will find friendly people who are willing to give assistance or support when possible. At least that is what I found here! Enjoy your time with the Board!
For humidity increases, have you tried humidity trays? I put pea gravel in some trays that were sold for setting by the door to put wet shoes and boots on. Then I put a wire grid across the tray to keep the pots elevated above the gravel and filled the tray with water. This increases the humidity very well. I live in Indiana, USA, but my apartment is VERY dry and the trays do help. That and daily mistings. You just don't want the orc's to sit in the water, so if you don't have a wire or plastic grid, you can just raise them by setting them on bricks or up-turned clay saucers - just keep them from setting in the wet gravel.
The little greenhouses I have seen are often for seeds or small plants and do not have good air circulation. If not, the plant will develop fungus and that is a killer!
Anyway, this is how I raise my humidity - along with mist, mist, mist!
Steve
(mothorchidgirl -sorry I was writing this when you posted - didn't mean to repeat your great advice! - s.r.)