Summary For auditory integration (AI) therapy, the largest body of literature relates to its use in autism. Several systematic reviews of AI therapy in the treatment of autism found limited evidence to support its use. No comparative studies were identified that evaluated the use of AI therapy for other conditions.
The actual cost to install a gas fireplace may vary depending on your location, the product selected, complexity of the installation process, additional accessories purchased, and other options. 1  Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 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.