Nowadays the consumption of conventional energy is increasing a lot. After spending some days in ICF we found certain energies being unused. And when we reach the spring shop we saw a furnace in which, it is for the operation of preheating of the steel bar used for the production of springs. This furnace is working using a gas burner of temperature around 900˚C. This furnace is having an exhaust duct exposed to the atmosphere, and we observe that the outlet duct is releasing a huge amount of temperature to the atmosphere. Then we think about to use these wasting hot exhausts to some other reusable way. There are a paint booth and oven near to the furnace in which, it is used to bake the painted spring. Then we noticed that the paint booth is working with a gas burner and an air pumping fan. So the paint booth is gaining an extra amount of LPG and external electrical power. The temperature used for baking the spring is around 100˚C. Then we think about an idea of bringing the hot air from the exhaust of the furnace to the paint booth.