My tents are in my basement which is heated by a pellet stove. Burning wood does create a lot of dust and when running flat out due to cold temps outside it will drop your humidity to low numbers. Think I'm sitting at 40% with it off and on, and with it running hard I have to turn on the humidifier to keep the humidity at 40%. I'm not sure of any difference in yield; this run finishing up next week will be my best yet but I feel its more from getting the room dialed in than anything else.