What does thermal mass refer to in greenhouse design?

Thermal mass refers to materials that are capable of absorbing and storing heat within a greenhouse. This concept is crucial in greenhouse design, as it helps to regulate temperature fluctuations, leading to a more stable and controlled environment for plant growth. When the sun heats these materials—such as concrete, brick, or stone—they store the heat during the day and release it slowly at night. This process can significantly reduce the need for additional heating or cooling systems, enhancing energy efficiency and promoting healthier plant development.

The other options do not align with the definition and purpose of thermal mass. While humidity control, pest management, and decorative items play roles in greenhouse management, they do not pertain to the fundamental concept of thermal mass and its function in regulating temperature.