I’m still trying to work out the most effective way to increase humidity in my glasshouse. I have under bench misters but they really are not fine enough to have an affect. I do have fans and such, so some mist gets blown around but not enough to make a difference. I need to come up with a way of getting moisture in the air. I have come across another solution – foggers. A horticultural place sells them here. They are set up the same way as my misters but they produce a much finer spray. This looks like it would be a really effective way of increasing humidity. The only thing is I’m a little worried about rot. Do the plants stay dry with this fine mist or do they end up soaking wet. Does anyone use or have used this sort of setup to increase humidity? Any advice appreciated. I really don’t know how else I can increase the humidity.

David

I've used them. You get rot. You have to have entirely atomized humidity, no mist no fog, although fog is better. Is your system closed air, or open air?

Currently it is closed. I do have vents. Vents belows the benches as well as automated vents at the top. I generally keep these close though as keeping them open just means low humidity. I also have an evaporative cooler which draws air from the outside when the temperature reaches 28 oC. I do have a fan going all the time so the air is not still.

How do you affectively obtain atomized humidity?

I'm assuming when you use a fogger you don't have the glasshouse looking like the Scotland Moors the whole time. Just short burst to get the humidity up.

Have you looked into building a wet pad? Its basically the same thing as your evapaorative cooler, but does not draw air from the outside. (Closed loop inside the glass house).


It may also be possible to just build a selective intake (diverter) duct on your evaporative cooler, so when the temp is below 28 the air supply will come from inside the greenhouse, and humidity will go up. When temp hits 28 it will pull outside air (with reduced humidity) which will produce the better cooling effect.