In the second place, the comparison in this argument is incomplete a
nd selective. The arguer discovers that using fans alone is more cost effective than using air conditioners alone, and that using both fans and air conditioners are the least expensive way of cooling. However, the arguer fails to provide any information regarding the actual amount of time for using, respectively, fans alone, air conditioners alone, and both fans and air conditioners in those three groups of surveyed families. It is very likely that these three groups of families are located in three very different climatic regions of Claria, and hence the amount of days of the year during which they need to cool their houses varies significantly. Families living in cooler areas of the nation certainly cool their houses for fewer hours and hence use less electricity than families living in hot areas, no matter what cooling appliance they use. Unless we are certain that the surveyed families live in the same climatic region, or that they need to cool their houses for the same amount of hours in the same year although they live in different regions, which is very unlikely, we have every reason to doubt the trustworthiness of this comparative study. Furthermore, the arguer ignores the possibility that the families who are spending more on electricity may be using more electricity for purposes other-than cooling. Unless the arguer also takes this factor into consideration, the comparison is unconvincing.
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