A contribution to the Search for Extra-Terrestrial Intelligence (SETI) is made by searching for astro-engineering products of advanced civilizations. A photometric survey, covering 5 wavelength bands, of 72 or 59 old main sequence stars (autumn or spring launch) shall be performed in order to assess infrared excesses compatible with the presence of large astro-engineering products like Dyson spheres that emit a blackbody spectrum of several hundred K temperature. This survey serves to identify candidates for Dyson spheres which subsequently shall be considered for more detailed observations in a separate follow-up programme either with ISO (detailed spectral investigation) or in another regime of the electromagnetic spectrum from another observatory. Additional 10 or 15 objects (autumn or spring launch) which show infrared excesses in the 12 or 25 microns IRAS measurements shall be investigated in more photometric detail at 13 wavelengths. This programme serves to reveal ultimate indication of the existence of Dyson spheres or otherwise. The usage of ISO is crucial for the success of the observation programme as only ISO currently offers the high sensitivity, especially with ISOPHOT, that is needed to identify a several hundred K blackbody spectrum flux excess generated by an astro-engineering product superimposed on a several thousand K blackbody background spectrum of the host star. The observation programme makes also an important contribution to the knowledge of developed main sequence stars in the infrared, thus supplementing existing ISO GT and OT observing programmes.