27 Sep '12, 4pm

The air ducts in your home could be wasting energy and costing you money.

The air ducts in your home could be wasting energy and costing you money.

The typical forced air system uses supply ducts to deliver warmed or cooled air from the furnace, heat pump, or central air conditioner to rooms around your home. Return ducts are used to pull back air from those same rooms so that it can be heated or cooled again. The diagram below shows how this works. A fan in the furnace, heat pump, or air conditioner pushes air through supply ducts (on the right) into the living space. The conditioned air heats or cools the rooms. The conditioned air will lose heat through the walls and ceiling of the house if it is warmer than the temperature outside of the house, and it will gain heat if the outside temperature is warmer than the temperature indoors. In either case, the room air is pulled back through return ducts (on the left) by the fan to be reconditioned by traveling again through the furnace, heat pump, or air conditioner.

Full article: http://www.homeenergy.org/show/article/nav/consumerinform...

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