This is a very old problem and there are solutions, like the Franklin stove [1]. However, we don’t really use fireplaces as a primary source of heat anymore. Th

This is a very old problem and there are solutions, like the Franklin stove [1]. However, we don’t really use fireplaces as a primary source of heat anymore. Their use is really more decorative. If they were really intended for heat generation, so one of the other posts mentioned, we would use a completely different design. [1] https://en.m.wikipedia.org/wiki/Franklin_stove https://en.m.wikipedia.org/wiki/Franklin_stove