If I want the heat to last into the evening, I always set my left hand knob (room temperature) to 1. Otherwise, if you set it higher, it loses the heat during the daytime. The right hand knob would depend on the weather. I start with 1 in October and slowly increase it to 6 in Jan, but it is worth watching the weather forecast so that you can adjust it a day ahead.
diggerhugh, June 2009