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A switchable dual\u2010mode Janus\u2010structured composite is developed by integrating a polyoxymethylene fiber\/acrylate resin\/BaSO\n                    <jats:sub>4<\/jats:sub>\n                    aerogel cooling layer with a graphene aerogel\/paraffin wax (PW) phase\u2010change composite heating layer to achieve synergistic passive radiative cooling, solar\u2010Joule heating, and latent\u2010heat storage. The heating layer exhibits high thermal conductivity, high solar\u2010to\u2010latent heat conversion efficiency, high latent heat capacity, and high electrical conductivity. This permits a maximum sub\u2010ambient temperature rise of 17.4\u00b0C across the day. The cooling layer delivers a solar reflectivity of 96.2%, a mid\u2010infrared emissivity of 94.0%, and a low thermal conductivity of 0.053 W m\n                    <jats:sup>\u22121<\/jats:sup>\n                    K\n                    <jats:sup>\u22121<\/jats:sup>\n                    , achieving a maximum sub\u2010ambient temperature drop of 21.3\u00b0C and a genuine radiative net cooling power of 110.4 W m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , with an additional transient thermal buffering provided by the latent heat of PW (239.7 J g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). Outdoor tests verify diurnal regulation and paraffin\u2010induced temperature hysteresis. Building energy simulations across 15 Chinese cities demonstrate annual energy savings exceeding 10.8% in most regions, with reductions of 9.5 and 15.1 MJ m\n                    <jats:sup>\u22122<\/jats:sup>\n                    in heating and cooling demands, respectively. This work provides an effective strategy for all\u2010weather thermal management and sustainable energy savings under diverse climatic conditions.\n                  <\/jats:p>","DOI":"10.1002\/smll.76156","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T10:28:24Z","timestamp":1791368904000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Switchable Dual\u2010Mode Janus Composite for All\u2010Weather Passive Radiative Cooling and Solar\u2010Joule Heating in Energy\u2010Efficient Buildings"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-9205-0521","authenticated-orcid":false,"given":"Tao","family":"Shi","sequence":"first","affiliation":[{"name":"State Key Laboratory of Organic\u2013Inorganic Composites Beijing University of Chemical Technology  Beijing China"},{"name":"School of Materials Science and Engineering University of Jinan  Jinan Shandong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yatao","family":"Wang","sequence":"additional","affiliation":[{"name":"Coal Chemical R &amp; D Center Kailuan (Group) Limited Liability Corporation  Tangshan Hebei China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yumeng","family":"Dong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Organic\u2013Inorganic Composites Beijing University of Chemical Technology  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huan","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Organic\u2013Inorganic Composites Beijing University of Chemical Technology  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaofeng","family":"Ma","sequence":"additional","affiliation":[{"name":"Coal Chemical R &amp; D Center Kailuan (Group) Limited Liability Corporation  Tangshan Hebei 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