In heating and air conditioning (HVAC), there are many different formulas that need to be put to use. Numbers are used throughout almost every single HVAC system. These numbers aren't just sitting there, but help engineers do their job more effectively. At the end of an HVAC formula, you usually have a result that gives you something helpful about the system or building you're working on. This article will cover some common HVAC formulas you might run into. The HVAC industry is filled with math equations and formulas. The first step to understanding the math behind these equations is to understand the units of measure. These units are used in the equations and help us calculate very specific information about our systems. Understanding these units is critical for understanding how to solve problems using HVAC formulas. One key unit of measure that is used often in HVAC formulas is the British thermal unit (Btu). A Btu, or British thermal unit, is a traditional...