Hi!
I'm engineer, and looking for HVAC load calculation software.
I'm owning
PHP Code:
Integracad 
, a software for calculating heat loss, and pressure drop in piping's. I'm not satisfied with this software because is not cheap, not optimized, and have many gliches..
I can upload, but its protected with usb key..
I will grateful if there exist a version of Carrier HVAC for Ventilation and heat loss calculation, with enabling keys ..