Add to ORKGA sustainable building design should be compliant with the even more pressing en-ergy saving requirements - as in NZEB - and high levels of Indoor Environmental Quali-ty. In this context, despite it is accepted that different facets of IEQ could have antago-nistic effects on building energy demand, relatively few studies are aimed at investigat-ing the mutual interaction among its four components (thermal, acoustic, visual and in-door air quality). From this point of view, the hue-heat hypothesis is based on the idea that light and colours can affect the thermal perception. Particularly, spectral power dis-tributions of light shifted to short wavelengths seem to promote a cooler thermal percep-tion and the vice-versa. To verify this hypothe...