House A is an old, drafty colonial house that is poorly EZ Battery Reconditioning Review updated by its owners. However, the furnace is fairly modern, and operates at about 85% of the efficiency of a new, modern system. Unfortunately, the air ducts that channel the heat from the furnace have several air leaks, and the furnace is being stored in a cold, uninsulated basement. The attic also has a mere 4 layer of old fiberglass insulation installed. While the windows are not ENERGY STAR® approved, they do have double-paned glass.

House B is a 1970s home, whose owners take the time to update it when possible. In this case, the furnace is very outdated, and while it still works, it operates at about half the efficiency of a new, modern system. The owners service their system frequently, and have already sealed all holes in the air ducts. Their basement is finished and insulated, and the attic is properly sealed and insulated with new fiberglass insulation. They have single-paned windows installed that are not ENERGY STAR® approved.

In this case, we can see that the owners of House A are paying much more for their heat than the owners of house B. While replacing these old windows would increase the energy efficiency, there are many more cost-effective ways to reduce their utility bills. For example, instead of spending $10,000 or more on a window upgrade, the owners of House A may want to consider using the same money on a combination of air sealing the home to eliminate the drafts, insulating the basement, repairing the air ducts, or sealing and insulating the attic.

In the case of House B, however, we can see that the basement and attic are insulated, and the home has already been air sealed. Because the furnace is outdated, heating comes at a premium. In this case, it can be very cost-effective to keep as much heat inside the house as possible. So replacement windows are a pretty good idea.
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