HI:JUST COMPLETED INSTALL OF STOVE HEARTHMOUNT IN A MASONRY FIREPLACE (EXTERNAL CHIMNEY) WITH A RAISED HEARTH 20FT. SS LINER , INSULATED BLOCKOFF PLATE. 1600 SQ. FT. BI-LEVEL HOME STOVE IS ON LOWER LEVEL. I AM BURNING A MIX OF WHITE AND RED OAK , OSAGE ORANGE , SUGAR AND SILVER MAPLE ALL SPLIT AND AGED AT LEAST TWO YEARS. 25 YEARS EXPERIENCE WITH A FIREPLACE NONE WITH A STOVE. MAX STOVE TEMP HAS BEEN 425 DEGREES ROOM TEMP 75 (RM 16 X 24) REST OF HOUSE IN LOW 60'S . OUTSIDE TEMP 20. WHAT ELSE CAN I DO TO INCREASE OUTPUT HOUSE IS 50YRS. OLD WITH ABOVE AVERAGE INSULATION THANKS LARRY