You have your home all snugly tight with the right amount of insulation in all the right places and you turn on the heat and the room heats up, but… the kitchen is still cold; you need a central heating system of some kind. The central heating systems are some of the most efficient systems because they generate the heat and then pump it all over the house in the same proportions that you select. That way, the rooms that are being used gets the most heat and the rooms that are not being used gets quite a bit less…