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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 Vented gas logs (need a working chimney) run about $300-$550, and ventless/unvented gas logs (without a working chimney or pipes) are $350-$600, with installation estimated at $200-$350 for a basic project, according to Hearth.com. Options include fans to move the heat, remote controls, wall switches and wall-mounted thermostats. 2  Inserts cost $1,200-$2,900, with professional installation adding another $600-$1,000. 3  A direct-vent gas fireplace doesn't need a chimney and is a way to add a fireplace where there isn't one.