I understand your comments. However, I checked the accuracy of my readings as follows:
1. Although my hygrometer is store purchased, it did agree with another store purchased unit.
2. I have a wet-dry bulb hygrometer, which should be accurate, and it agrees with the hygrometer I used.
3. And, although the furnace mounted humidistat is not a professional reading device, when I heard it click on and off at about 30 to 35%, that seem to me another confirmation of my duct readings.
And finally, a 50% difference seem to me more of an issue than accuracy.
Also, my hygrometer read about 60% next to my humidifier when it was reading about 30% inside the duct work going to the humidifier.
Last edited by Jerry8C; 11-10-2011 at 06:15 PM.