The Calorimeter can be utilized by user to determine the cooling and heating capacity of unitary air conditioners and split systems. It provides a method for determining capacity simultaneously on both the indoor side and the outdoor side, and the outdoor side capacity provides a confirmation. It conforms to standard GB/T 7725-2004 and JIS B 8615-1. By measuring the heat and water supplied(or drained) to balance the tested air-conditioner,we can acquire the performance result. The indoor side and the outdoor side measuring results shall agree within 4% of the value obtained on the indoor side for the test to be valid.