The hot and humid weather countries across the world are facing the problem of comfort living due to extreme hot climates during summer arising year by year due to emission of Green House gases. Global warming is showing its impact on every nook and cranny of the planet in one way or the other. The hot climate situation is difficult to overcome mainly when the humidity is not at the comfort levels. So the use of air conditioners had started in all most all the developing countries and the industry is growing at a rapid speed. But the use of air conditioners has unnoticeable adverse effect on the climate. The use of Air conditioners requires lot of energy and most of the times it is observed that the energy is being wasted due to poor loading calculations and estimations. CFX-5 makes the engineers and building experts to make approximate modeling. This project book gives the idea, to the beginners who are working on building energy projects and air conditioning simulations, on how to learn the fundamentals, basics and methodologies to complete the designing, evaluating and solving processes.