Lennox Industries Inc. announced the release of its Commercial Load Calculation Software, powered by Elite Software's Commercial HVAC Load Calculation Software (CHVAC). The new software quickly and accurately calculates the maximum heating and cooling loads for commercial buildings. Cooling loads can be calculated with either the Cooling Load Temperature Difference (CLTD) method or the new Radiant Time Series (RTS) Method. The program allows for 50 zones, which can be grouped into as many as 50 air handling systems. The software automatically looks up all cooling load and corrections factors necessary for computing loads. In addition it can look up outdoor design weather data for over 2,000 cities around the world.