Or when you don't have central heating/air. Or when you can't afford a retrofit of your system with a heat pump. Or when you need to target dry a small room o

Or when you don't have central heating/air. Or when you can't afford a retrofit of your system with a heat pump. Or when you need to target dry a small room or a pair of wet shoes. They have plenty of other uses, the only caveat I guess is that they aren't used as the main source of heat.