VENT FREE GAS LOG HEATER

Ok so here is the deal. I found out that the 100lb tank only had 20lbs in it when they installed it. They did the math & I used about 5lbs a day. I don't heat the whole house. I use it to take the chill off in the living room & so I can turn off the electric base board heat in the room. The electric heat bill is going to kill me until I get an oil furnace installed. I have the thermostat set so it keeps the room around 67 to 69. Once I get the oil furnace in it will be for only show or when the power goes out.