I have a few questions, all of them regarding one subject:
1. In which cases need/must a HVAC company have a mechanic engineer as employee?
2. Do government or other public HVAC projects require HVAC companies to review the bid specifications and blue prints for errors?
3. Does the HVAC company have to take responsibilities for errors found during the project even if they were present in the original project description?

I will appreciate your answering all those points with comments.

Thank you in advance for your help