Denver gas line installation. The Gas Connection provides natural gas line installation and gas line repair. We also specialize in gas fireplace installation, gas fire pits, gas pool heaters, gas BBQ’s and gas grills..The average cost for a Fireplace and Chimney Specialist is $. To hire a Fireplace and Chimney Specialist to complete your project, you are likely to spend between $ and $ total..FAQs Frequently Asked Questions related to Fireplaces and Gas Logs. Do I need to service my gas fireplace? What kind of service is recommended for my gas fireplace?.Gas Fireplace Service and Repair. Natural Gas Services conducts a comprehensive service and repair of your gas fireplace, including everything from the overall appearance to the smallest function..