What does the 'ton' in tons of refrigeration refer to in HVAC terminology?

The term 'ton' in the context of HVAC and refrigeration refers to a cooling capacity unit that is equivalent to the amount of heat required to melt one ton of ice over a 24-hour period. Specifically, one ton of refrigeration is defined as the ability to remove 12,000 BTUs (British Thermal Units) of heat in one hour. This measurement stems from historic practices when ice was used for cooling purposes.

Understanding this concept is crucial for HVAC professionals, as it helps them determine the appropriate size and capacity of refrigeration and air conditioning systems based on the cooling requirements of a space. By knowing how many tons of refrigeration are needed, technicians can make informed decisions about equipment selection and ensure optimal performance and efficiency.