What does the abbreviation "BTU" stand for?

The abbreviation "BTU" stands for British Thermal Unit. This unit is a measure of energy, specifically used to quantify the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit. It is a standard measurement used in the heating and cooling industries, including gas furnace systems, to indicate the energy content or heating capacity. Understanding BTUs is crucial for selecting and sizing heating systems to ensure they can efficiently meet the thermal demands of a space. While the other choices offer variations on the term "British," they do not accurately capture the correct definition and application of BTUs in HVAC and energy contexts.