It is a good source if properly attended to and the room is the correct size. If the room is too small, there could be humidity problems, and if the cooler isn’t properly filled and emptied, there could also be a mold problem. When it is not being used, is the room adequately ventilated? There are many factors that have to be evaluated. Read the owners manual, and look for reviews online for the unit you would like to use. I have a portable unit in my garage, so we can use it on the hot days, for a playroom and workshop.