Start
Here is where your journey into HVAC nerdiness may start. Check out our latest videos, tech tips, and podcasts all in one place.
September 27, 2026
What’s Inside a Schrader Valve? Full 3D Breakdown
Ever wonder what's inside a Schrader valve every time you connect a service hose? This animation cracks a Schrader valve open in full cutaway so you can see the internal components most techs never actually get to look at.
Get Tech Tips
Subscribe to get free tech tips.
Follow Us On Social Media And Podcast Platforms
Download HVAC School App
Check our latest Tech Tips
How does a typical single-phase motor know how fast to run? Typical induction motors depend on the electrical cycle rate of the incoming power (measured in hertz) for their speed. Our power in the US makes one complete rotation from positive electrical peak to positive peak 60 times per second, or 60hz (50hz, or 50 […]
Read more
Relays can be used for many different control applications, including controlling fans, blowers, other relays, contactors, valves, dampers, pumps, and much more. A 90-340 is a very common, versatile relay that many techs have on their truck, so we will use it as an example. A relay is just a remotely controlled switch that opens […]
Read more
We’ve all heard some version of the phrase “heat rises,” but is that really true? First, we need to remember that heat is energy, not matter. Heat is a force, not a thing. While heat may result in changes to matter (stuff), it isn’t matter itself. When we add heat to stuff, the molecules inside […]
Read more
Our Most Popular Videos
