Any decisions related to energy-efficient renovations in your housing company are made by the general meeting. Each shareholder of the housing company has the right to submit proposals to the general meeting. You can propose that the board of directors should investigate how the energy efficiency of your housing company could be improved. What you can also do is to improve the energy efficiency of your own flat by replacing old appliances with new energy-efficient ones, lowering room temperature and turning off lights when they are not needed.