Allow Hearth to be stacked
Allow hearths to be "stacked" across multiple floors on the Z axis and as long as a chimney is on top they will function appropriately.
So if Floor level 1 has a Hearth, and floor level 2 also has a hearth on the exact same x and y spot of the map, then floor level 3 has a chimney at same x and y spot, both hearths would function as if they each had a chimney.
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+1 to that, actually have the situation where it might become necessary, dude i gave the appartment on the lowest floor wants a hearth and i just build it there, would be super sexy if i can just stack them on the floors above that.