We heat our house with a free standing, air tight Regency brand wood stove. During the Winter, we keep it going all day long and let it die out after we "hit the hay". If it gets below 65 during the early morning hours, then the gas furnace will kick on. We burn nothing but Ponderosa Pine and I can't believe the small amount of cresote that is produced with burning this type wood. It does burn rather quickly but we have 35 acres of this type pine, Pinion and Juniper and I have a hydraulic splitter. Sure saves on the propane bill and this wood heat is so much more comfortable than the gas heat. Nothing like sitting back in the recliner in the middle of the day with the stove blazing away and taking a little well deserved snooze. Hey, I can do that any time during the day since I am retired.....