There is increasing interest in the usage of renewable and new energy sources in the era where we have record high oil price. Among these new energy sources, we have analysed in CFD model, the case which used ground source heat in order to generate required heat for air cooling. The experimentation method allowed heat movement analysis through measurement of room temperature, humidity and air flow simulation. The focus of research area was on method of utilisation of underground pit in cool tube system for piping layout and maintenance. For the ventilation equipment of the “Pit”, we have alternated existing system of heat supply for the air conditioning to an energy saving system which recycles normal air exhaust to provide air intake for the compressor room by making it to go through necessary underground heat exchange process. This research has established CFD model on Pit’s cool-tube system through heat and air movement simulations, of which data was based on actual measurement and verification.