The answer depends on what you want to measure: the area to be heated or cooled, the power of the heating or cooling kit. Since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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A unit can be a measure of length. It is one-dimensional. A squared unit can be a measure of area. It is two-dimensional. A cubic unit can be a measure of volume. It is three-dimensional.
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
The international (SI) unit of mass is the kilogram.
The standard unit to measure mass is kilograms.
foot is the most precise way to measure any unit