To　explore　how　the　coldest　local　thermal　sensation　(LTS)　affects　the　overall　thermal　sensation　(OTS)　after　initiating　air　conditioner,　three　experimental　scenarios　(29　-＞　23　degrees　C,　29　-＞　25　degrees　C　and　29　-＞　27　degrees　C)　were　created　to　simulate　the　real　circumstances　in　buildings　with　split　air　conditioner　(SAC).　29　young　students　were　recruited.　The　skin　temperature　of　10　body　segments　along　with　the　LTS　of　6　body　segments　and　OTS　were　measured　continuously.　Results　showed　that　the　foot　demonstrated　the　coldest　sensation　and　the　largest　skin　temperature　change,　and　it　exerted　stronger　influence　on　the　OTS　than　other　body　segments.　However,　the　dominance　of　the　LTS　of　the　foot　over　the　OTS　showed　great　dependence　on　air　conditioner　set　point　temperature　and　air　conditioning　duration.　Moreover,　the　two　aspects　of　air-conditioner　use　behavior　interacted　with　each　other　when　affecting　the　approaching　degree　of　the　OTS　toward　the　LTS　of　the　foot.　Based　on　developing　and　validating　models,　differences　in　the　approaching　degree　change　trend　over　air　conditioning　duration　under　different　set　point　temperatures　were　observed,　and　then　the　turning　point　for　the　set　point　temperature　between　the　two　change　trends　was　identified.　When　t(set)　＜　26　degrees　C,　the　OTS　quickly　approached　the　LTS　of　the　foot　and　surpassed　it　over　time.　When　t(set)　＞=　26　degrees　C,　the　approaching　speed　significantly　reduced.　The　time-varying　and　temperature-varying　characteristics　of　the　relationship　between　the　OTS　and　the　LTS　of　the　foot　provided　new　insight　for　understanding　air-conditioner　use　behavior　in　SAC　buildings.