This thesis has been written with our society’s current energy-situation in mind.

Although it only deals with one particular block of buildings, the solutions and suggestions presented herein are quite applicable on other objects of the same type.

This thesis is intended to be used as a guideline for energy-preserving projects in general, with an eye to buildings erected during the Swedish “million-programme” in the sixties and seventies.

The paper starts with the acquiring of all necessary blueprints and technical specifications. It then moves on to a thorough description of the buildings in question, and their heating- and ventilation-systems.

Followed by this the reader is guided through the successive stages of energy-perseverance measures that are available, and possible. Reasoning around the economic factors concerning all measures is also held.

The paper ends with conclusion, and a discussion concerning the delicate issue of the higher return-temperatures possibly reaching the district-heating plant.