“Electric Motor energy transformation” by coach_robbo is licensed under CC BY-NC-SA 2.0. Many scientists and philosophers contributed to the discovery of the law of conservation of energy. People have been aware of the concept of energy conservation since ancient Greece. These ancient Greek philosophers, such as Thales of Miletus, believed that all substances on Earth […]

Time and time again, low-voltage wiring gets the better of HVAC technicians everywhere. Sure, the wires are color-coded, but that doesn’t mean they’re easy to understand. On top of that, schematics sometimes look like ancient tablets written in hieroglyphics or something. But that’s where HVAC School comes in. There is a new 3D animation video […]

One of the most common questions we get from techs is about using a voltmeter to diagnose a high voltage circuit. It's especially tricky when a tech is used to working on a low-voltage or 120V circuit, where there is a clear “hot” side of the circuit and a clear “grounded” side of the circuit. […]