I know the 13.5K unit that Airstream used to provide for the 34' unit was woefully inadequate based on talk with many owners. Many folks supplimented with an 11K unit over the bedroom area. Thank goodness that Duo-Therm has come up with the 15K Penguin. Jack Canavera STL. Mo. '04 Classic S.O. 30' WBCCI 5024