Air conditioner sizing may seem like black magic. So much goes into the calculations. However, understanding how air conditioners are sized can help dispel some of the mystery.
Air conditioner size does not refer to its dimensions. Instead, it is the measurement of its cooling capacity. An air conditioner’s size is measured in British Thermal Units (BTUs). All air conditioners are measured in BTUs. Most central air systems average between 20,000 and 50,000 BTUs. That is a lot more power than window air conditioners, which average 5,000-10,000 BTUs. Your air conditioning installation technician can help you determine the right size air conditioner for your home.