How does a heat pump operate in heating mode versus cooling mode, and what is the role of a reversing valve?

How does a heat pump operate in heating mode versus cooling mode, and what is the role of a reversing valve?

• A. In cooling mode refrigerant absorbs indoor heat; in heating mode the reversing valve changes flow so outdoor air provides heat; the reversing valve switches between modes.
• B. In heating mode refrigerant absorbs outdoor heat; in cooling mode it releases heat outdoors; no valve movement.
• C. Heat pumps only provide cooling; reversing valve has no effect in heating.
• D. The reversing valve increases system pressure regardless of mode.

Answer: (A)