Come on! I can't be the only techno-junky who owns and loves these atomization gadgets.
I know they are expensive but I'm telling you they make environmental control a bunch easier. They also give peace of mind when away foe extended periods of time.
I don't know how much of a "techno-junky" you are, and how much time you might have on your hands, but I'm in the process of designing a similar system with an Arduino, and some Temp/Hum sensors.
While it would save a lot of money, it would take some time, and a basic knowledge of programming in C