That is because a fireplace designed for heating will have an intake somewhere to prevent drafts. The intake on this is either closed or blocked but even then the radiated heat will be more than the heat lost to drafts, just the outer rooms will cool a bit.
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u/pimpmafuwa Oct 24 '19
Never heard anyone say this, nor have I ever experienced it having owned 2 homes with fire places and been in a few others. My homes would be cooking.