HVAC School

HVAC School is a free training platform for heating, ventilation, air conditioning and refrigeration technicians. It was co-founded by Bryan Orr, an American contractor who began in the trade in 1999, and it started as a podcast in 2015.

The videos explain how systems really work and how to fix them. Topics include refrigeration cycles, compressors, airflow, electrical faults and measurements. There are 3D animations, field demonstrations, full classes and interviews with people in the industry. The focus is on understanding why something happens, not just following steps. Many lessons use real tools and gauges, so you can see exactly how measurements are taken on the job.

Some highlights include:

A lesson on basic refrigeration, explaining why technicians read temperatures rather than just pressures.

A detailed class on why compressors fail and how to diagnose, replace and protect them.

A 3D animation showing how a multi position service valve works inside.

The channel has over 480,000 subscribers.

Heating, cooling and ventilation are a big part of building services engineering, and demand is growing as buildings move to heat pumps. This channel shows the thermodynamics, electrics and problem solving behind that work. It is written for American technicians, so some refrigerants and rules differ from the UK, but the science is the same. It suits anyone weighing up a building services apprenticeship or a mechanical engineering route.