Several years ago I posted a query about inserts or stoves that would allow us to burn our plentiful supply of firewood in our two-sided fireplace (between the diningroom and livingroom in our open plan house). An energy auditor told us not to use the fireplace, which would draw the heated air out of the rest of the house and increase our high electric bill. I gather an insert that opens on two sides cannot be tight enough to be EPA rated as efficient; however, I'm just looking for something that makes some contribution to our heat, rather than a detraction, if such a thing exists. This is in Pennsylvania.