Final answer:
A swamp cooler is a cooling device that can be accessed for inspection, services, and replacement without removing permanent construction. It works by evaporating water to cool the air. The term 'swamp cooler' originated from the practice of using wet blankets to cool the air in ancient Egypt.
Step-by-step explanation:
A swamp cooler is a cooling device that is accessible for inspection, services, and replacement without removing permanent construction. It is commonly used in desert areas with high temperatures and low humidity. The term originates from the ancient Egyptians who used wet blankets to cool the air by evaporation. The swamp cooler works by passing warm air through wet blankets or pads, causing water to evaporate and cool the air.