If you have a large amount of evaporation, I would suggest turning them up. I currently have two running and am going to get a bigger third one. You are probably wondering why am I telling you this. I was just installing some extra outlets in my basement tonight. When I pulled back some insulation and I noticed the plywood behind it was soaked. I proceeded to check all around my basement and I found the same results everywhere behind the insulation. I should be OK since I just moved in last May and I should be able to dry everything out before any rotting occurs, damage from wood expanding or any other permanent damage happens. Too much moisture and wood can be a serious problem. Also, the extra moisture can promote unhealthy mold growth. Be careful everyone, Shawn.