Gas, oil, and kerosene heaters provide spot, supplemental, or primary heat. They're powered with gas, oil, or kerosene, so they're ideal for heating areas without access to electricity, like warehouses, workshops, garages, jobsites, and tents. They can be used outdoors or indoors with proper ventilation. Gas floor heaters install on or in the floor. Portable gas, oil, and kerosene heaters may be moved wherever heat is desired. Gas-fired duct furnaces connect to a natural gas line and are used as components of a heating, heating/cooling, or makeup system. Whole-house gas furnaces produce heat for multifamily homes. Gas wall and ceiling heaters install on walls and ceilings to provide heat without taking up floorspace.