Adequate construction and thermal i

Adequate construction and thermal insulation of external walls, roof and floor
Reduction of potential energy losses through windows, doors, gates and other openings (e.g. by providing adequate shading systems and automatic door closure)
Optimize energy consumption of systems (e.g. air conditioning, heating systems, cooling water systems, hot water systems, ventilation systems, compressed air systems, lighting systems)
Use of heat exchangers or heat pumps
Use of cleaner or renewable energy (gas, solar, wind)
Use of office equipment with low energy consumption