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1 Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
Ventless (also called vent-free or unvented) gas fireplaces don't need a chimney or vent, and are either zero clearance (right against a wall) or close clearance (a few inches away). They cost about $400-$1,500 plus installation of the gas lines and any desired mantle or surround. Some states do not allow the use of ventless fireplaces or restrict their use. Some ventless models require you to keep a window open while using the fireplace.