Ya, I just saw that the grow was in the bedroom but no mention of a tent. Definitely changes things.
As mentioned it is unlikely that a humidifier will be needed. When the tent is there set it up and put the lights in. Put the thermometer and the humidity thing (can't remember what they are called) in the tent and let it run for a day or two. Write down the temps when the lights first come on and when they go off. Check the temp half way through the lights off period. After a couple of days it gives a good idea of what to expect once a plant or two are in the tent.
As mentioned it is unlikely that a humidifier will be needed. When the tent is there set it up and put the lights in. Put the thermometer and the humidity thing (can't remember what they are called) in the tent and let it run for a day or two. Write down the temps when the lights first come on and when they go off. Check the temp half way through the lights off period. After a couple of days it gives a good idea of what to expect once a plant or two are in the tent.