Hydrogel-based　smart　windows　have　the　potential　to　reduce　the　energy　consumption　associated　with　air　conditioning　and　lighting　systems.　Most　existing　hydrogels　exhibit　a　unidirectional　response　to　a　specific　temperature,　limiting　their　applicability.　In　this　work,　a　bidirectional　temperature-responsive　hydrogel　was　developed　by　incorporating　hydroxypropyl　cellulose　(HPC)　into　a　physically　cross-linked　copolymer　matrix　of　N-(2-hydroxyethyl)　acrylamide　(HEAA)　and　acrylamide　(AM),　with　cetyltrimethylammonium　bromide　(CTAB)　used　to　stabilize　lauryl　methacrylate　(LMA)　micelles　in　a　deep　eutectic　solvent　(DES)/H2O　binary　solvent　system.　At　higher　temperatures,　the　hydrogel　becomes　opaque　through　phase　separation　driven　by　the　lower　critical　solution　temperature　(LCST)　of　HPC.　At　lower　temperatures,　another　optical　transition　seems　to　be　governed　by　the　growth　of　micelles　formed　from　LMA.　The　temperature　operating　window　can　be　tuned　by　changing　the　composition,　keeping　a　rapid　optical　switching　response　of　less　than　30　s.　Furthermore,　due　to　the　dynamic　reversibility　of　hydrophobic　associations　and　hydrogen　bonding,　the　hydrogel　exhibits　excellent　mechanical　strength　and　self-healing　capability　at　room　temperature.　The　presence　of　the　DES　also　contributes　to　its　antifreezing　performance,　allowing　the　hydrogel　to　retain　flexibility　even　at　−20　°C.　With　its　integrated　functionalities,　this　material　represents　a　highly　promising　candidate　for　smart　window　applications　in　real-world　environments.　©　2025　The　Authors.　Published　by　American　Chemical　Society