There are different means of heating homes and businesses.  Most homes use a central heating and cooling system or also called forced air systems, because they send air through ductwork to heat your home.  Radiators use a radiant systems that create heat. and deliver it via components such as radiators that radiate the heat into the home. Boilers which are used a lot in business buildings are a traditional radiant heat source.  Which ever heating unit you use it should be checked every year to keep it to running efficiently.  Also remember to change the filter regularly!  Energy Star rated furnaces are up to 16 percent more energy efficient than baseline models and can save about $94 in energy costs per year!