I found with my room that when I added a humidifier that ran fan system over an evaporation system it would click on and in ten min the alarms were going off as the temps dropped 7-10 degrees the cycle constantly repeated. Based on my experience I'd try a warm mist one the temps won't tank on you as much and the particles of water are much smaller and disperse better. Personally I got rid of it and have been using a porous rock (rainbow stone and or sandstone.) any rock the bubbles when you soak it will work it slowly releases the water to the enclosure. I found it raised the humidity about 10% and lasts for 4 days. I then trade the dry stone for a just soaked one. Just my solution I don't know if it will work in your set up but it did in mine.
Alex