There are many companies that do air conditioning, very few that do both refrigeration and air conditioning. So you say what is the difference when my Airs not working. Refrigeration is far more complex to install and work on. A Refigeration service technician is far more trained and knows more about the workings of cooling systems than your average A/C tech. Its very easy for a refrigeration tech to diagnose and repair an A/C, Its very hard for a A/C tech to do refrigeration. That’s the difference. Hire a company that does it all.