I have a residential building, heating only (radiators) with natural ventilation.  Per Ashrae I must model the baseline building as a Packaged terminal air conditioner (Ptac) system.  I've also been told I must model my proposed building as a Ptac system as well because I cannont take credit for  designing a system without cooling.

1) Does this make sense?

2) If that is how I am to model my system, I will have additional fan energy from the months trace is simulating cooling.  Can this additional fan energy be subtracted from my model?

Thanks.