it's good to control a small room's climate. humidifiers can be cheap, so it's not cost prohibitive.
I would use an evaporative humidifier and not one that you can see the vapor emenating .. the latter are the ones that cause that white dusty film on everything. A humidifier with a wick is a bit more expensive to run, but worht it to avoid that film of dust developing on your buds... it's one thing on a table, but stick plant material can be wiped off.
buy that bacteriostatic stuff... or you'll have to clean the water reservoir every 3-4 days and the wicks will grow shit before you get your money's worth out of them. I use hum for seedlings, early vege and drying areas. I buy a couple wicks every year, for a reference on cost... the bacteriostatic solution is key to their longevity.