Lessons Learned
As shown by the analysis presented above, the combination of retrofitting strategies described can cover a considerable percentage of a university building's heating, cooling and lighting needs, while improving thermal comfort for its users.
A combination of some or all of the scenarios described above under the form of a package would be the most efficient strategy to follow in case initial cost is not a problem - for instance if a refurbishment of the building is decided.
Some low cost measures, however, especially those dealing with electric lighting improvements and passive cooling techniques, can have a considerable impact on energy efficiency and comfort even if applied one at a time. Such measures usually involve control and maintenance schemes of lighting and hvac systems. Most impressive is cleaning of light fixtures, the absence of which can reduce illumination levels by 50% in three years!
Last but not least, administrative measures, user motivation campaigns and information exchange on energy conservation are very important both for the efficiency of the whole system and the development of energy consciousness for staff and students, involving little or no additional cost.