Large amounts of greenhouse gas emissions come from residential, industrial and commercial buildings in urban areas. Consequently, decarbonisation plans and design solutions must be implemented to reduce emissions. In this context, the thesis proposes an aerial thermal infrared remote sensing mission concept for detecting building heat losses, inspired by a previous study on energy demand estimation using thermal images regarding the city of Turin. Thermal imaging applications can be carried out by equipping aircraft, drones or satellites, depending on the level of detail required, with cameras capable of collecting emitted infrared radiation. Specifically, the proposed mission is conceived for a fixed-wing unmanned aerial vehicle (UAV), comparable in size to a small general aviation aircraft.