Hello, Colorado humidity currently could be as low at 35. I am currently growing my orchids in a metal shelving (2 levels). I covered it with plastic, orchid pots are on top of a shelving wire on a water tray which upped humidity to 50-68. There is a humidifier. There is a slit on the side for air flow, a fan oscillating 3 feet away. My collection grew to 15 orchids. Now, I plan to convert a room in the basement into a growing area (instead of building a GH in the backyard, I thought i will be able to save in heating bill). I plan to cover the high grade carpet with something like a linolium (just in case i need the room back). The room is painted white. There is a small window (north light) but my neighbor's house is blocking the sun. I will probably use plenty of artificial lights.
I worried about molds, algae that may thrive. Would I be able to prevent molds or algae to thrive in the room? I forgot what Louis suggested to cover the walls with. Some kind of plastic material (?).
Any suggestion that will help me build a healthy indoor orchid growing area, I appreciate it.