Answer :
Final answer:
To save energy if leaving the house on a hot day for a short period, you should turn the air conditioner temperature up. This decreases the amount of work the machine needs to do to transfer heat outside, saving energy.
Explanation:
If you're planning to leave your cool house for a half hour on a hot day and want to save energy, the best practice would be to turn the temperature setting on the air conditioner up (option c). Turning the temperature setting higher means that the air conditioner doesn’t have to work as hard to maintain the increased temperature inside the house, thus saving energy.
How does this work? An air conditioner and similar devices, such as heat pumps and refrigerators, operate based on the principle of heat transfer. This process involves the movement of heat from a warmer environment to a colder one. On a hot day, an air conditioner works by transferring heat from indoors to outdoors, thereby cooling the interior of your home. When you increase the temperature setting, the air conditioner does not need to move as much heat outside, reducing the amount of work and energy it needs to function.
Of course, this strategy only saves energy if you're leaving for a relatively short period and plan to turn the air conditioner back on when you return. If you were to be gone for an extended period, turning the air conditioner off would use less energy overall. This is because it generally requires more energy to keep the air conditioner running consistently than it does to cool the home down after being off for a while.
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