Doolin's Troubleshooter's Bible This book covers the repair of Air Conditioning, Refrigeration, Heat Pumps, and Heating. The book has chapters on Basic Principles Of Refrigeration, Freon And Temperature Pressure Relationships, Charging Window Units And Refrigerators, Servicing Commercial Equipment, Basic Principles Of Electricity, Electric Motors, Electrical Troubleshooting Of Hermetic Compressors, Motor Starting Devices, Troubleshooting Window Units, Household Refrigerators And Auto Air Conditioning, Central Systems, Gas And Electric Heating, Heat Pumps, Ice Machines and Refrigeration Recovery And New Refrigerants.