Humidity is the measure of how much water vapor is in the air. High humidity goes to low humidity. In the same vein, water vapor in the air moves from higher concentration to lower concentration. To watch the complete video on the 4 Basic Energy Rules for HVAC, head on to our website or click on the link below. https://www.youtube.com/watch?v=Eow-Vioalwk #HVAC #hvaclife #airconditioning #Refrigeration | HVAC School