Can butterfly only simulate thermal pressure ventilation?

[kinonotofu]

I think you can do it by setting the boundary conditions other than temperature and pressure at the opening to zeroGradient, but be careful because the calculation will be unstable. In some cases, you may want to consider placing the building in a very slow flow.
The heat source can be set by the wall temperature or by the method described in the following link.

Adding heat sources in hvac simulations

Hi all, While running hvac simulations is it possible to add heat sources? To keep things simple I can uniformly distribute people and lighting load over the floor area. Or should I make a box and assign certain surface temperature according to the heat load I am expecting? Any help is much appreciated. Thank you!