On days when I'm not at work which really isn't very often, I run this Woodstock Gas Franklin non-stop in my basement. I sleep on the couch down here, etc. I'm used to my Hearthstone at the office where I generally keep it 76 degrees in my workspace. Now, I am so spoiled by that wood heat, I run this Franklin gas to create a similar environment in my basement. Question is, if we run this thing on average 4 hours a day, how much is the damage going to be natural gas wise? It's 70 something percent efficient and our furnace is 92 percent. However, the furnace doesn't give any radiant heat and as soon as it cycles off the basement gets chilly.