About Units

Horsepower: Horsepower (HP) is a unit of measurement of power, originally defined as 550 foot-pounds per second. It is commonly used to measure the power output of engines. For example, the engine of a car might be rated at 300 horsepower. There are different standards for horsepower, including mechanical horsepower, metric horsepower, and electrical horsepower.

Btu per hour: BTU per hour (BTU/h) is a unit of power that describes the power of heating and cooling systems, such as furnaces, ovens, and air conditioners. One BTU per hour is the rate at which one British Thermal Unit of energy is transferred in one hour. For example, the cooling capacity of a residential air conditioner might be rated at 10,000 BTU per hour.