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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.
Cost of ventless gas fireplaces. Yeager charges around $900 for a ventless gas fireplace installation that includes gas logs, which typically cost between $200 and $300 if purchased separately. Gas logs for vented fireplaces cost $1,200 to $1,400, he says. Swerdlin, whoâs only licensed to install vent-free fireplaces in Maryland, says the fireplaces have improved over time and remain a convenient option. âThere are no liners you have to deal with and no chimney issues,â he says. â[Low] cost and heat are the top reasons people want them.â.