BTU

Understanding BTU: The Single Number That Shapes Your Comfort BTU, or British Thermal Unit, is the amount of energy needed to raise one pound of water by one degree Fahrenheit. It is the core unit we use to size furnaces, air conditioners, and heat pumps. Think of BTU like the sizing on a pair of shoes: get it right and everything fits, go too small or too large and every step is uncomfortable. Th ...