In most cases, space heater s are used when the main heating system is not doing its job or the central heating unit is too expensive to install or operate. Space heaters are usually self-contained, free-standing air heating appliance intended for installation in the space being heated and not intended for duct connection. If you only want to heat one room or supplement inadequate heating in one room, space heaters are less expensive. They can also boost the temperature of rooms used by people who are sensitive to cold without overheating your entire home. Electric space heaters are the only non-ventilated space heaters that are safe to operate inside of your home. They also avoid indoor air quality concerns. Most space heaters depends on convection heating which is the circulation of air in a room. The best convection space heaters incorporate a heat transfer liquid, such as oil, heated by an electric element. Heat transfer fluid provides some heat storage, allowing the heater t