Answer
Warm air rises. The air near the ceiling is warmer than that near the wall, so there is a greater difference between inside and outside temperatures at the ceiling. Thicker insulation is installed to slow the loss of heat.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 16 - Think and Explain - Page 317-318: 81
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