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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 17 - Think and Explain - Page 334-335: 97
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