The numbers in the table reflect the cost of replacing the existing units with units of the same size. The total amount of air-conditioning would remain the same. Therefore, we calculate the implementation cost as the cost difference or cost premium between the cost of the high-efficiency unit and the cost of the standard unit. Installation costs vary according to the company installing the units, but the installation cost is affected only by size and not by SEER ratings. There are no additional maintenance costs associated with the higher-efficiency units.
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