Created to bring students up to speed in their skills and knowledge as quickly and safely as possible to perform basic servicing and troubleshooting of air conditioning and refrigeration associated with commercial buildings. The practical, common sense approach used in this course makes it perfect for novice technicians and experienced HVAC technicians alike. Anyone who needs to understand the basic operation, maintenance, and troubleshooting of air conditioning and refrigeration systems for commercial or residential locations will benefit. Since 80% of AC& R problems are electrically related, the section on electrical troubleshooting is unique to this course and not offered elsewhere.