I have a forced air heating system. In the harsh Michigan winters, occasionally the power goes out. When this happens I can still have flames from the gas pipe, but without the air movement, depending on the heat rising is not the best. I have a few kerosene heaters for backups in case this happens. It may not make the house "cozy" but it will keep from freezing the pipes and surviving the day or two it may take the electricity to come back. Yesterday I was at Lowes and noticed the standalone blue-flame and ceramic ventless gas heaters. They are as low at $159 and take both LP and Natural gas and are 99.9% efficient. And range from heating 400 sq. feet to 1000 sq. feet. I had a buddy heat his entire 800 square feet house with 2 of these. A larger one and a smaller one. But I was looking at more for a back up use. Anyways, I was wondering if anybody had used these in this capacity and would it be worth investing into? Or should I just stick with my Kerosene and hope for the best?