Our studies used a carefully controlled experimental design totest if the colour temperature of the illumination, operationalizedhere as 6500 K (‘cold’) vs. 2700 K (‘warm’), affected thermal com-fort, either assessed by survey responses (Study 1) or observedby changes in clothing (Study 2). Contrary to other studies, wemeasured and modelled ambient temperatures on a per-subjectlevel and accounted for other potential covariates. In addition, ourstudy used ambient temperatures that are similar to those found inoffices [13], increasing the likelihood of transferring findings intoreal-world settings.