AC Service Tech LLC

AC Service Tech is a training channel about heating, ventilation, air conditioning and refrigeration, often shortened to HVAC. It is run by a teacher of high school and adult education who also owns an HVAC business in southern New Jersey in the United States.

The videos answer practical questions with clear, step by step procedures. Topics include refrigerant charging, heat pumps, gas furnaces, wiring, electrical fault finding and the refrigeration cycle. Most are filmed on real equipment, with meters and gauges on screen so viewers can follow each reading. The channel also sells courses and books, but the free videos are full lessons in their own right.

Some highlights include:

A detailed look at how an electronic expansion valve controls refrigerant flow, and how a technician tests one.

A side by side comparison of silver soldering and brazing copper pipe, including why technicians flow nitrogen through the pipe while brazing.

A full troubleshooting session on an air conditioner, from connecting test equipment to finding and fixing the fault.

AC Service Tech LLC has over 680,000 subscribers.

Heating and cooling buildings is a huge part of the push to cut carbon, especially as heat pumps replace gas boilers. In the UK this work sits within building services engineering, and apprenticeships are a common way in. The equipment and refrigerants shown follow American practice, so some details differ here. The thinking behind them, from thermodynamics to electrical fault finding, carries straight across.