The British thermal unit (Btu) is a measure of heat, which is a form of energy. It was originally defined as the amount of heat required to raise the temperature of one pound of water by one …

British thermal unit (Btu) is a measure of the heat content of fuels or energy sources. One Btu is the quantity of heat required to raise the temperature of one pound of liquid water by 1&deg …

Jun 18, 2025 · BTU stands for British Thermal Units and is a measurement of thermal energy. It was first used in the late 1800s and has since become one of the most common units of …

Jul 30, 2025 · BTUs measure heating and cooling capacity. Learn how BTUs impact comfort, plus how to calculate your needs and choose the right system for your space.

Jun 3, 2025 · BTUs and Tons – In central heat pump and air conditioner lingo, the term “tons” is used to describe heating and cooling capacity. 12,000 BTUs equals 1 ton of heating or air …

Air conditioners, furnaces, and stoves are generally rated by BTUs. (Though "BTUs" is often short for "BTUs per hour;" in air-conditioner ratings, for instance, "BTUs" really means "BTUs of …

Two free calculators estimate the number of BTUs needed to cool or heat a room or house based on its size, insulation, and some other conditions.