Adaptive　regulation　of　solar　and　thermal　radiation　by　windows　in　diverse　(hot　and　cold)　climates　is　essential　to　reduce　building　energy　consumption.　However,　conventional　hydrogel-based　thermochromic　smart　windows　lack　thermal　radiation　regulation,　and　have　difficulty　to　combine　high　solar　regulation　with　excellent　freezing　resistance.　It　is　challenging　to　integrate　the　above　performance　into　one　hydrogel-based　thermochromic　window.　Here,　we　firstly　prepared　poly(N-isopropylacrylamide-co-N,　N-dimethylacrylamide)/ethylene　glycol　(PNDE)　hydrogels　with　tunable　and　excellent　freezing　resistance　(below　-100　degrees　C)　by　adding　the　anti-freezing　agent　ethylene　glycol,　and　assembled　PNDE　hydrogels,　polyvinylidene　fluoride　and　polymethyl　methacrylate-silver　nanowires　panels　into　a　freezing-resistant　smart　window　with　solar　and　thermal　radiation　regulation　(STR).　PNDE　hydrogels　had　an　excellent　thermochromic　performance　with　luminous　transmittance　(T-lum)　of　89.3　%,　solar　regulation　performance　(Delta　Tsol)　of　80.7　%　and　tunable　phase　change　temperature　(tc,　22-44　degrees　C).　The　assembled　STR　window　showed　high　Tlum　of　68.2　%,　high　Delta　T-sol　of　62.6　%,　suitable　tc　of　similar　to　30　degrees　C　and　freezing　resistance　to　low　temperature　of　-27　degrees　C.　Moreover,　the　different　thermal　emissivity　(0.94　and　0.68)　of　the　two　sides　of　the　STR　window　gave　it　the　ability　of　radiative　cooling　in　hot　climates　and　warm-keeping　in　cold　climates.　Compared　to　the　conventional　thermochromic　windows,　the　STR　window　promotes　heat　dissipation　in　hot　conditions　while　reduces　heat　loss　in　cold　conditions　and　is　applicable　to　diverse　climates,　which　is　a　promising　energy-saving　device　for　reducing　building　energy　consumption.