Renovated old building Old buildings are very popular places of residence . They are usually found in prime residential locations and exude a certain je ne sais quoi. However, old heating systems do [...] Renovated old building Old buildings are very popular places of residence . They are usually found in prime residential locations and exude a certain je ne sais quoi. However, old heating systems do not meet today’s ideas of comfort and efficiency, nor do they comply with the current German Renewable Energies Heat Act. The radiators they use may also be [...]