No problem... you may not even need a humidifier depending on where you live but the gauge will tell you.
The human body won't even notice high humidity indoors until it gets maybe 65%+
Where I live up north, in the winter my indoor humidity drops to about 15% when it gets below 20F even though it's snowing and 100% rh outside so mine runs all the time.
I know this is an old Thread but putting a kettle in your growroom, boiling it and then leaving the lid open works great you can make the humidity up to atleast 65%.
Other cheap methods are hanging a wet towel in the growroom, giving your plants a mist of spary with a spraybottle and having boiling water on a plate.