I have about ten feet of orchids in a south window, all on top of humidity trays. The room is open to other rooms. The humidity was about 30%. I started running a warm air humidifier. I cannot contain the humidity to the room since it was open. This one humidifier, running full tilt, got the humidity near the plants up into the 40's. I added a second humidifier. This let me get the humidity to 60%. Could probably go a little higher running both at full blast. I usual keep it in the range of 45-55% near the orchids, and the air in the entire first floor of our house is also benefitting. We noticed that we feel a lot better ourselves having more humidity in the air.
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