We purchased a 4200s/f home this Spring. We learned real quick that the LL will not be comfortable in the winter. Our options are to 1) add a corn burning stove to help heat the LL 2) try to zone the LL even though we'll have to do drywall repair and duct work or 3) swap out the 2yr old Trane furnace for a different model that will help heat the LL and be more efficient. We also hope to lower our LP usage this year. Suggestions?