The Heat Transfer in Moist Air interface (

) is automatically added when the 
Moist Air version of the predefined multiphysics interface 
Heat and Moisture Transport is added. A 
Moist Air (Heat Transfer Interface) model is active by default on all domains.
 
    When this physics interface is added, the following default nodes are added in the Model Builder: 
Moist Air, 
Thermal Insulation, and 
Initial Values. Then, from the 
Physics toolbar, add other nodes that implement, for example, boundary conditions. You can also right-click 
Heat Transfer in Moist Air to select physics features from the context menu.
 
    The settings are the same as for The Heat Transfer in Fluids Interface. This means that a first order discretization is used by default for the temperature.