Every air conditioned building is a mechanical engineering project.

makeup air unit

Yes, it uses mechanical energy to convert the gases to high pressures in the compressor. The compressor gets energy from electrical source, then that source is converted to mechanical energy, then to hydraulic energy.

Mechanical control system for an compressor?

your condensor is clogged up, or your condensor fanmotor is not working, or your compressor struckup due mechanical problem inside of your compressor.