We recently purchased and my husband installed a Harmon p 68.....I have a few questions if someone wouldnt mind answering. We have a 2800 square foot home, bi-level. We put the stove on the first floor. We are hoping to use no or very minimal propane. We are wanting to heat maybe 600 sq feet of the first floor and all of the 2nd floor. What I'm wondering is the L and H under room tem and stove temp....what does that do?? Blow more heat that is already there based on the temp you set and does it burn more pellets or something different? Also, I see alot of questions and surveys on here regarding manual or auto. Do most of you experiment to see what is better and why?? I don't get it. Please help!! What are the typical settings you all use in the coldest part of winter??