The HEG does not have any office in charge of visa procedures and issues. 

As an incoming student, you are required to apply for a visa/permit of stay and follow the necessary instructions on your own (see details below).

Visa

First of all, it is important to check whether a visa is necessary :

For further information

If you need a visa, you must apply about 4 months before entering Switzerland by contacting the nearest Swiss diplomatic or consular representation in your country of residence

Stay Permit

Upon your arrival in Switzerland, you will be required to register at the Residents Registration Office (Office cantonal de la population et des Migrations - OCPM) within 14 days in order to ask for a residence permit. It takes several weeks for the permit to be issued.