All types of buildings require lighting and consume a lot of electricity. Tubular daylighting devices (TDD) can be an alternative, A sun tunnel is an innovative yet cost-effective way of allowing and promoting natural light. Designed especially for those areas of the house that can't reap the benefits of natural sunlight, (TDD's) also influences the thermal comfort in the spaces, as it limits the heat gain in the spaces that feed them with natural light. This research provides a method to enhance Energy Use Intensity (EUI) in a laboratory room through minimizing artificial light usage and thermal heat gain Accompanied by natural light minimizing energy use by 18% could be beneficial at laboratories in universities building as they are one of the main energy consumers between other spaces enhancing thermal performance of indoor spaces as well. This study indicates the significant potential for energy savings and daylighting advantages of employing the planned lighting-heating coupled TDDs system in buildings.