Thermochromic　smart　windows　have　been　widely　developed　for　solar　regulation　to　save　building　energy.　However,　most　current　smart　windows　still　exhibit　a　single　responsiveness　to　a　specific　temperature,　which　is　not　conducive　to　daytime　energy　saving　or　nighttime　privacy　protection.　Herein,　a　low-temperature　response　is　achieved　by　pre-initiation　of　the　monomer　acrylamide　(AAm)　and　acrylic　acid　(AA)　in　the　synthesis　of　P(AAm-co-AA).　Then,　N-isopropyl　acrylamide　and　AAm　are　introduced　into　P(AAm-co-AA)　to　form　a　pre-polymerized　precursor　solution.　The　liquid　precursor　solution　can　be　encapsulated　within　two　quartz　glasses　and　synthesized　in　situ　to　prepare　smart　windows,　which　exhibit　a　high　visible　light　transmittance　of　84.4%,　excellent　solar　modulation　of　69.5%,　and　bidirectional　temperature　responsiveness　(cold　and　hot).　In　addition,　the　upper　critical　solution　temperature　and　the　lower　critical　solution　temperature　of　the　hydrogel　and　the　light　transmission　interval　between　the　two　temperatures　can　be　flexibly　adjusted　to　adapt　to　different　climates　and　individual　user　needs.　The　designed　smart　window　maintains　a　high　light　transmission　within　the　human　body＇s　comfort　temperature　range.　The　bidirectional　temperature　response　window　achieves　the　dual　functions　of　energy　saving　and　privacy　protection,　making　it　an　ideal　smart　window　candidate　with　good　prospects　for　practical　applications.