My gas bill was billed from Dec. 13, 2007 to Jan. 16, 34 days was $125.47. On Dec. 17, I left for California. I left the heater on 48 degrees. My heater was turned on by my neighbor on Jan. 6 to 68 degrees. I was home Jan. 8. So as you can see, I was gone for three weeks (21 days) of that bill. I'm very happy to have a pellet stove that I can run and not have to pay Semstream for all my heating.