Saverain, you really don't understand how a green house works... It has nothing to do with plants...
looking for solutions for ENS is great, but you have to know what you're talking about.
A green house creates heat and humidity by being a transparent structure made of glass or plastic which stands in the sun that heats the soil in it all day long which causes evaporation of water that simply condenses on the green house's walls because it cannot escape as the air into the green house in very restricted. It's basically like a primitive sauna, and has nothing to do with plants.
You can stuff your house up with plants and you won't elevate the level of humidity in the house even by 1%.