Automation is the present trend which is going on in industries. From cleaning of dishes to preparation of latest equipment everything is prepared by automation technology. So, in this paper, we have concentrated on an important part of Air conditioning Industry which is the calculation of heat loads for a city building plan. In this paper, we have used E-Quest software by the action of which Calculation of volumetric flow required for an air conditioner along with the summer heat load is being found out easily accurately and in a precise manner. We will get accurate load calculations within the shortest time.