This varies based on the size of your home, your use of heat source and your heat source. I will tell you I have a small 2 bedroom house and to fill my propane tank (for heat, cooking and hot water) it cost me $600 to fill - and that should last me though spring and into summer. My electric bill is about $150 a month - and I have several computers, tvs, etc. I do keep my heat at around 66 degrees but I could probably do better (take shorter showers and turn lights off etc.) If I can answer any other question please let me know!