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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 (chimney required): The cost of vented gas logs varies depending on the size of your fireplace and the style of gas logs you choose. 2  Vented gas logs start at about $115 per set, and designer vented gas logs can cost $400 or more. This does not include the cost of any gas-line work needed. 2  Installation costs for a top-vented gas fireplace: Approximately $300 to $1,200. 3  Direct vent gas fireplace installations: These are more expensive and can cost up to $5,000.