Reducing energy consumption and eliminating energy waste is becoming increasingly important for Hungary, one way to do this is to modernise buildings and improve their energy efficiency. It is increasingly recognised that this is not only a means of achieving sustainable energy supply, reducing greenhouse gas emissions, guaranteeing security of supply and reducing import expenditure, but also enhancing the country’s economic competitiveness. The planned development will greatly contribute to efficiency gains at all stages of the energy chain, from production to consumption by consumers. As part of the planned investment, the entire facade and flat roof thermal insulation and the replacement of the external doors and windows of the building will result in energy savings, and will be installed with a 24,96 kWp solar panel system. A retrofitted thermal insulation system is installed on the existing façade. The thermal insulation used is 140 mm or 160 mm thick EPS insulation board, where fire protection is justified in the same thickness of stone wool thermal insulation. The doors and windows are turned with 3 cm thermal insulation, which is secured by gluing. In the case of increased windowsills, a new ledge is made together with the replacement of the window. On the plinth we use 140 mm thick XPS closed cell polystyrene foam thermal insulation boards. On the entire surface of the flat roof, additional thermal insulation is applied, to which new waterproofing is added. The existing insulation is sometimes 250 mm (100 + 150 mm disaggregatedA) stepproof EPS insulation, and EPS insulation and modified bituminous thick sheet insulation in 150 mm thickness. Bituminous plate insulation uses flame melt welding laying technology. The polystyrene sheet of thermal insulation is placed on top of the bituminous primer layer. This waterproofing layer is made of modified self-adhesive bituminous thick sheet in one layer with a 4 mm thick plate. Doors and windows are replaced with state-of-the-art 3-layer glazing (Ug=0.8 Wm2K) with highly thermally insulating plastics. The profile of the doors and windows is 5 air chamber design, heat-bridge-free, colour-proof and UV-resistant. Glazing structure: 4 mm Low-E + 12 mm air gap with Argon charge + 4 mm Float + 12 mm air gap with Argon charge + 4 mm Low-E, designed according to the energy regulations in force. The college intends to cover a significant part of their use of electricity using renewable energy sources with the help of solar HMKE to be installed on the complex flat roof structure of the college. The system with 96 polycrystalline solar panels (260 Wp) with a nominal peak power of 24.96 kWp is attached to the roof of the dormitories. Taking into account the physical size of the panels, the roof structure of the facility and the orientation of the roof surface, the supporting structure is carried out by means of a dome system, with an angle of inclination of 10 degrees, fixed to stainless steel supports. Solar panels connect to 2pcs inverter (T1 Inverter: Fronius SYMO 12.5-3-M, T2 Inverter: Fronius SYMO 12.5-3-M. The T1 inverter has 2x16 and 1x16 panels, the T2 inverter has 2x16 and 1x16 panels. The main institutional distributor will be expanded in line with local conditions and the size of the power plant.