Runs Nice But Had to Return

Wonderful Unit ... ultrasonic ... makes almost no noise when running. Much easier to clean than other humidifiers ... doesn't accumulate that grimy deposit as there is no heating element. But ... the output rate was not high enough to bring the humidity up past 40% in my 11' X 17' bedroom with the door closed. I suspect it is because I have forced air heating which is very strong and probably overwhelmed the unit. Need a more powerful one which I am searching for. It WAS able to raise the humidity to around 60%-70% in the late fall before the really cold weather (the forced air heat was cycled on less because the weather wasn't really cold yet) ... but no higher than the 70s%. For $150, it wasn't doing the job.