| A central heating system is a very easy thing to visualize. A furnace uses electric coils or the combustion of fuel to heat the air within it, and a fan then pushes the warm air through a series of tubes, called ducts, into the individual rooms. As the fan pushes air out of the furnace, it also needs to draw more air in, so a return duct is also provided within the heating system. The return duct pulls air from the house and directs it back to the furnace, where it is re-warmed and redistributed in an endless loop. |  |
One of the first things the heating contractor will take into consideration is the overall energy efficiency of the home, as well as the remodeled space. Homes with good insulation, good windows and doors, and a low amount of air infiltration is simply easier to heat, and as a result, the ducts serving each space can be smaller. Homes with poor energy efficiency require larger ducts to overcome the heat loss and keep the spaces sufficiently warm.
The next consideration is the furnace, which needs to be of sufficient size to provide an adequate amount of heated air for the volume of the home and amount of heat it’s losing. If the furnace is large enough, then a new duct run can typically be added to the system pretty easily. If the furnace is too small, then you need to either upgrade the size and/or efficiency of the furnace or improve the home’s energy efficiency through better insulation, better windows, or other means.
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