I just got a delivery of oil, so I know how much it cost to heat my house over the last 54 days (since the last delivery). I have a 3 br single family house, with 1 heating zone (whole house), that I keep set at 18 ºC (~64 ºF) 24/7. I also get hot water from the oil. I paid $6.41/day for the oil, which would be $192.30 for 30 days.