boiler design and zones

KC_Jones

TerrS said:

pecmsg said:

Use the term conditioned space. Heat does move from ceiling to the floor above but very slowly and there’s no losses. 

Normal an attic is not considered conditioned so you insulate the floor because heat moving to the attic IS lost. 

Yes but I was thinking in reverse. The colder air from the attic penetrating thru the ceiling and then dropping into those rooms.  I probably have heat loss also, as the heat rises and nothing but drywall in those ceilings to stop it.



Heat moves to cold always.

https://en.wikipedia.org/wiki/Second_law_of_thermodynamics