What should the delta T (ΔT) be? What do you mean!? 20 degrees, of course! We are referring to the air temperature drop across an air handling unit or evaporator coil in cooling mode. Actually, depending on who you ask, the answer will range between 18-22 degrees Fahrenheit. Heck, I’ve heard some insist that […]

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. Although we primarily work with our hands, our eyes are one of our most valuable assets in the industry. After all, […]

This article was written by Regan Murphy. Thanks, Regan! Disclaimer: Any percentages used are the opinion of the author and not based on any actual facts. You are probably already used to getting the model and serial numbers of the equipment. You may have even made a habit of getting the part number, but there […]