The following s for use of interns in HVAC.
1. Insure that the mentor is one that loves to teach. Someone that is accessible, funny, etc.
2. Challenge them in applying their school work, give them tasks like calculations, energy modeling using software, etc..
3. Have them create some sort of needed database for the department - something tangible they can show in their resume and profitable for the company. Use their brain, not just give them Autocad work.
4. Take them to the meetings.
5. Give them a task requiring: Observation, research, analysis, determination, recommendation - AND write a consice report.
6. Give tham a going away gift for their cheap labor.
7. Give them an award for the database they created, etc.
8. Give them a letter of recommendation as a reference for their future job seeking.
9. Show them how to make a fee proposal, establish a drawing list and task description, specfication writing, meeting time, survey, coordination times, QA/QC, etc.
10. Teach them briefly the legal aspect of your work, liabilities, etc.
11. Teach them how and where to find information quickly, how to use databse efficiently.
12. Teach them how to distinguish between relevant and irrelevant information on drawings.
13. See to it that they have fun while working for you. Go have a beer with them on happy hour (and pick up the tab for them).
I have had many interns, and I must say that I enjoyed having them around me, they bring such a life and a new vision (sometimes wrong vision but it's OK) that is not influenced by repetitive tasks of our environment.
In return, I think they enjoyed being around me. I even had an invitation to an intern's wedding (even though he was long gone), and for me, that is a satisfaction in itself.
Interns show you more appreciation than your boss.