Profile: Humidity Source LLC is a manufacturer and supplier of quality humidifiers & HVAC accessories. Reverse Osmosis (RO) uses advanced semi-permeable membrane technology to remove and reject impurities in the water beyond the capabilities of normal filtration. We provide a variety of accessories to supplement our humidifiers and custom designed humidification systems. Wall and duct mounted humidistats, air duct pressure switches and water treatment systems are the accessories available. Water treatment is highly recommended for our centrifugal atomizer humidifiers to reduce salt and mineral build up in the unit.