A BTU (British Thermal Device) is a rating used to identify the home heating or in the case of an Air Conditioner the air conditioning capability of a home appliance. https://pipewiki.org/wiki/index.php/At_Our_Business_The_Future_Of_Air_Conditioner_Installment:_Most_Recent_Technologies_And_Fads_We_Are_Devoted_To_Remaining_At_The_Forefront_Of_The_Heating_And_Cooling_Industry.