For those operating a solar kiln with electric fans on a thermostat, do you adjust your thermostat setting seasonally to a given point above average ambient temperature, or use some other strategy for kiln control? My understanding is that significant drying occurs with the kiln at least 20 degrees F above the outside air temp and have been setting my thermostat in that range. I currently have it at 65, as the early winter temps so far have been unusually high, but I expect them to go down to the typical 20 degrees. I don't want to waste power pushing air through the stack at temps too low to accomplish much. Any advice?