Folks,
First up, thanks to Bill and David for answering my last question.
My follow up is this:

I'm trying to model a separate outside air system with heat recovery. So I
set it up so all systems take outside air from my OA system (defined first).
But if I then try to add heat recovery to the OA system total energy (due to
cooling and fans) goes up.

I'm guessing that a factor in this is that the air goes to all the other
systems but then doesn't come back to the original OA system. (How to you
specify that?) Although, cooling loads should still go down since exhaust
air, whose quantify I specified, is still cooler than outside air.

So, how do I show any saving with OA heat (or coolth) recovery, which I know
will be huge?

thanks in advance.
Nick