Hansen's disease, also known as leprosy, is a chronic bacterial disease that primarily affects the skin, peripheral nerves and upper airway.ansen's disease, also known as leprosy, is a chronic bacterial disease that primarily affects the skin, peripheral nerves and upper airway.
1 Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation. 2  The cost of a ventless gas fireplace is $500 to $2,500, and while there are additional installation costs, you may pay extra for finish work (such as a mantle, marble surround, etc.). The cost of a ventless gas fireplace is $500 to $2,500, and while there are additional installation costs, you may pay extra for finish work (such as a mantle, marble surround, etc.).
Gas log sets sell for about $200 to $1,000. Converting a traditional wood-burning fireplace to gas with an insert costs about $3,000 to $4,000, including installation and a chimney liner.Freestanding gas fireplaces often cost $4,000 to $5,000, including installation and venting.ost pellet stoves cost $1,700 to $3,000, not including installation, according to the U.S. Department of Energy (DOE). Installation could add a few hundred dollars or several thousand, depending on complexity.