What is thermal mass and how does it contribute to comfort?

• A. Stores and releases heat, moderating indoor temperature swings
• B. Repels moisture to maintain humidity
• C. Generates electricity through heat storage
• D. Absorbs heat and prevents any temperature change entirely

Answer: (A)

Thermal mass stores and releases heat, moderating indoor temperature swings. Materials with high heat capacity, like concrete, brick, or stone, soak up heat when it's warm and then release it slowly as it cools. This buffering smooths out the day-night temperature cycle, helping spaces feel more comfortable and reducing the need for excessive heating or cooling. It doesn’t repel moisture or generate electricity, and it doesn’t prevent all temperature change—rather, it slows and dampens it to improve comfort.