The odor is coming down from the chimney. When there is no heat going up the chimney, the air flow comes down through the cold chimney into the warmer room. What we do in the summer when we are not using our wood heater is to cover the chimney at the top with a heavy plastic that is secured to the flue. No down flow of air. Of course you have to put large sign of some kind that will get the attention of anyone who would like to start a fire. I would suggest one on the fireplace grate, and another at the wood pile!!! Also let the family know the situation!!!!
The odor is coming down from the chimney. When there is no heat going up the chimney, the air flow comes down through the cold chimney into the warmer room. What we do in the summer when we are not using our wood heater is to cover the chimney at the top with a heavy plastic that is secured to the flue. No down flow of air. Of course you have to put large sign of some kind that will get the attention of anyone who would like to start a fire. I would suggest one on the fireplace grate, and another at the wood pile!!! Also let the family know the situation!!!!