The EU aims to reduce energy consumption and greenhouse gas emissions in buildings by 2030 and achieve net-zero emissions by 2050. The Hungarian University of Agricultural and Life Sciences is developing a “smart energy map” for Hungary, considering local sustainable energy sources and optimal energy mixes. This research assesses sustainable energy for small airfield buildings. The analytic hierarchy process evaluates energy types based on feasibility, environmental sustainability, and practicality in airfield environments. Case studies on waste-to-energy, biomass gasification, solar power, and hydrogen technology demonstrate their efficiency in enhancing energy, reducing emissions, and promoting sustainability. The outcomes will inform the smart energy map, optimizing green energy for airfield buildings and structures, and contributing to a greener aviation sector.