Which of the following benefits is specifically enhanced by double-walled glazing in cooler climates?

Double-walled glazing is particularly effective in cooler climates primarily because it improves energy efficiency by reducing heating requirements. The design of double-walled glazing creates an insulating layer of air between the two panes of glass, which significantly minimizes heat loss from the interior of a greenhouse or building to the outside environment. This insulation quality is crucial in maintaining a stable and warm temperature inside, which is necessary for plant growth, especially during colder months.

In contrast, options like increased light availability, better airflow management, and improved pest control do not directly relate to the primary function of double-walled glazing in cold climates. While it's true that light levels can be influenced by glazing types, the primary focus of double-walled systems is not on enhancing light quantity but on improving thermal efficiency. Therefore, the primary benefit of reduced energy requirements for heating stands out as the most relevant advantage of double-walled glazing in such environments.