The impacts of light color on the human body have been widely studied, and published papers have shown that warm and cool colors psychologically affect the feeling of warmth. From the results of published papers, it was speculated that even if the room temperature changes by about 1 to 2℃, it can be compensated by the thermal effect of the light color. Therefore, a thermal sensation experiment was conducted on the subjects in a room that imitated the environment of living alone, and it was found that red light has the influence of compensating for the difference in room temperature of 2℃. We also examined the systems that links indoor lighting and air conditioning.