DISCLAIMER: HVAC School is NOT an official OSHA safety training resource! Although we provide safety tips in good faith, our website is not a substitute for safety training from an authorized OSHA training source. Locking out and tagging equipment is one of the most basic safety procedures in general industry and maintenance work, especially in […]

This website is for professional HVAC techs and those actively learning to become professional HVAC techs, not DIY homeowners. I feel like that needed to be said before I state these seemingly obvious facts, but these very obvious facts are so commonly mistaken that it needs to be covered. Take a look at the two […]

Take a look at the screenshots above. The one on the left is for Death Valley at 282′ below sea level, and the one on the right is Denver, CO, at 5,280′ above sea level. Notice the barometric pressure values; they are almost the same. That means that barometric pressure is corrected or “normalized” to […]