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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.
How much does it cost to install a gas central heating? The installation of a new gas furnace in a home with good pre-existing duct work will average $6000 to $8000. When the work involves renovation and the opening of walls, ceilings, crawl spaces or attics the costs can head upwards of $10,000 to $14,000.