Putting too much humidity into a house can do more harm than good.
With excess moisture you start to get condensation, especially in older
homes that don't have good insulation. In will start in areas like
windows that aren't well insulated or around recessed lighting
fixtures. Pretty soon, the paint in those areas becomes stained and
ruined. Put enough humidity in a poorly insulated home and eventually
you could promote mold and rot.

I'd get one that's sized appropriately, make sure it has an adjustable
humidistat that works, take it easy especially to start, and keep an
eye out for condensation.