What does the abbreviation BTU stand for in heating terminology?

The abbreviation BTU stands for British Thermal Unit. This term is a standard measure used to quantify the amount of heat energy. Specifically, one BTU is defined as the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit at a constant pressure. This unit is commonly used in heating and cooling systems to describe the energy output of furnaces, air conditioners, and other heating appliances. Understanding BTUs is crucial for choosing the right equipment for heating and cooling spaces, as it helps in calculating the energy efficiency and heat output needed for various applications.