Are vent-free appliances difficult to install?

Any of the 62 million homes that are supplied with natural or propane gas can inexpensively have a professional install a vent-free gas heater, fireplace, stove or log set. Installation usually takes less than an hour. Vent-free products can be installed in just about any room, from hard-to-heat basements and additions, or in rooms used less frequently. Vent-free products can even be installed outside to provide heat for your outdoor living areas. Unlike vented products, which have limitations on their placement, vent-free products can be put just about anywhere on an inside wall, under a window, in a corner or in the middle of a room - any area with access to a gas line. Always check with your local codes as there are some restrictions on placement.  more