This sign usually means that the exterior wall of the house needs energy-saving renovation or energy-saving insulation engineering.

In China, many cities are carrying out building energy-saving renovation projects to improve building energy efficiency and reduce energy consumption. This sign is used to remind residents that houses need external wall insulation or energy-saving renovation to save energy and improve living comfort.

If this sign is painted on the external wall of your house, you can consult the property or relevant departments about the content and implementation plan of the specific renovation or insulation project.