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Chvac stands for Commercial HVAC (an acronym that stands for "heating, ventilating, and air conditioning"). What this program basically does is helping engineers to calculate peak heating and cooling loads in buildings. Peak heating and cooling loads refer to the maximum loads that could happen in a given scenario. The scenario is composed by the building characteristics, its location and weather, and the use is to be given to it. Using Chvac, times involved in the calculation process decrease dramatically and this allows engineers to compare and decide among several design alternatives. Chvac can perform calculations following one of two available methods: CLTD method and the RTS method