I am looking for a whole house humidifier for a 1800 sq ft home with high ceiling. I was introduced to Aprilaire 400, 500, 600 and Honeywell steam humidifiers. I read many reviews and realized that they all have many pros and cons. Which is the one will do the job, bring humidity between 42 to 50% and will not produce the white dust? One of my kids has eczema. There are piano and hard wood floor need to be protected too.