Hello, Rekiyat. You need a professional version of the EES in order to call EES in TRNSYS. Best Regards LEE, Chun Kwong City University of Hong Kong Quoting Rekiya Suleiman <omohu_s@yahoo.com>: > I have EES academic commercial version, can I call it from the TRNSYS > simulation > studio. Please help urgently. > > Thanks > Rekiyat > > >