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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.
1 Direct-vent units average $1,200-$3,200, with installation running from $600 for a basic hookup to $5,000 or more for a fancy fireplace surround, according to Hearth.com. 2  Higher-priced popular options include a timer or a remote control.