Society is today focusing more and more on one of the major environmental issues - what should the world do to reduce carbon emissions? A start is to reduce energy consumption in homes but industries should also examine what they can do to improve. Our homes and buildings account for a sizeable proportion of the total energy use in Sweden. The aim of this study is to investigate how much energy an old industrial site can save through various investments and actions. Through various studies and calculations different options for savings is presented. Many older buildings should be revised, on where and what they can do to reduce their energy. The land surveyed is located in Dalsland and owned by the Stenqvist group. The largest part of the property is built in the 1960s. Many of the domestic distribution system were mounted during the same time and calls for measures to save energy. The various proposals for measures can be applied to other industries built in the same age or architectural style. Some of the measures I have come to that would be profitable is the installation of an exhaust air heat pump. With such a setup the company would save 250 000 SEK / year. A cheap but effective investment is power-frequency converter. Many of the fans that are installed today do not need to run with a constant full flow, but could instead unwind and save energy in that way. According to the computer programme Easy Save, up to 230 000 SEK / year can be saved. Because the property was mostly built during the 60s, when energy prices were much lower, the climate cover is a large consumer of energy. Back then neither construction companies nor owners cared if the structures were not tight when the energy was so cheap. Investigation of transmission losses and air leakage is done and the results show that the hypothesis is correct, the building has large heat losses. It can be difficult to convince industry leaders to review their facilities and what can be done to save. This does not mean that there usually are large energy savings to make, which can result in improved economic performance. This should be a sufficient traction for most