btu
abbreviationUK /ˌbiː tiː ˈjuː/
US /ˌbiː tiː ˈjuː/
A BTU is a unit that measures how much heat energy something has.
An air conditioner with a higher BTU can cool a bigger room.
OTHER MEANINGS
2. A unit used to describe the cooling power of air conditioners.
This small air conditioner is rated at 5,000 BTU.
3. A unit used to measure the energy in fuels like natural gas.
One cubic foot of natural gas contains about 1,000 BTU.
4. A unit used in heating and ventilation to compare heater sizes.
The heater puts out 30,000 BTU per hour.