First time I have seen this device.Is this monitoring the amount of moisture to the humidifier? Can someone explain how & what this does?
I also Have a crawl space question. The exterior vents are blocked and they are heating with the supply ducts of the furnace. Am I right in noting that the crawl requires proper ventilation. What is the requirement? !sq. ft. of vent for how mant feet of crawl? I think they are wasting a lot of heat at the crawl. Walls & subnot insulated.