Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 17 - Think and Explain: 97

Answer

The device is known as a heat pump. In the winter, it is moving heat from a colder place (the outdoors) to a warmer place (the indoors). In summer, it does the reverse.

Work Step by Step

This is discussed on pages 328-329.
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