Yeah, if you actually want to heat the house with fire you’ll want an insert or a wood stove. Otherwise most fireplaces in most houses are decorative, and one pays for that decoration with heat loss.
And even those will require draft from outside the insert / stove, so either you build them with an inlet from outside, you pull cold air from badly sealed doors / windows, or the chimney draft will be insufficient.
And even those will require draft from outside the insert / stove, so either you build them with an inlet from outside, you pull cold air from badly sealed doors / windows, or the chimney draft will be insufficient.