In this troubleshooting situation you have responded to a complaint that a 4-ton package unit air conditioner is not cooling. When you arrive, you find that the indoor air handler is running, the ...

A refrigeration or air conditioning system that is experiencing leaky valves or worn rings may be the most challenging troubleshooting scenario a technician will experience. That’s because a varying ...

Since this column's inception, we've received a substantial number of questions concerning air-conditioning troubleshooting. Answering each one would take quite some time, but we will attempt to ...