When discussing HVAC systems, what does the term 'thermal mass' refer to?

The term 'thermal mass' specifically refers to the capacity of a material to store heat. In the context of HVAC systems, thermal mass is critical because it can influence the temperature and comfort levels within a building. Materials with high thermal mass, like concrete or brick, can absorb heat during the day when temperatures are higher and release it slowly when temperatures drop, helping to moderate indoor temperature fluctuations.

Understanding thermal mass is essential for optimizing HVAC performance, as it can enhance energy efficiency and reduce the demand on heating and cooling systems. This characteristic directly affects how heat is stored and released within a living space, making it a vital consideration for effective climate control in buildings.