Time constant a building

What’s the “time constant” of a building?

Among the many parameters than play a role in the thermal behavior of a building, whether or not it is built to be a Passive House, the time constant is one of the least known ones. Nontheless, this parameter influences the way a building responses to changes in internal and external conditions, and therefore it is has a very important role in the correct operation of the building and its heating/cooling system.