How to raise humidity?

[Mississippi Steve]

Hi,

I need to raise my growrooms humidity, it's usually between 30-40%... Any recommendations on raising humidity?

I tried using jar of water, not much results...
Was thinking of wet sponge, would this work?

Any tips much appreciated.

Thanks:thumbsup:

How big is the grow room??? is it like a real room??...if so, fill a crock pot with water and turn it on. check an enthalpy chart to calculate how much moisture you need to put in the air to raise your humidity to around 50%