Steam　is　used　to　provide　heating　and　moisture　in　the　curing　process　for　the　production　of　precast　concrete　(PC)　construction　elements.　The　generation　of　steam　requires　large　amounts　of　fossil　fuels.　This　study　considers　the　incorporation　of　solar　thermal　energy　into　the　steam　curing　of　PC　construction　elements　for　reducing　the　need　for　fossil　fuels　and　associated　CO2　emissions.　For　this　purpose,　the　board　made　of　composite　phase　change　material　covers　the　inner　surface　of　the　main　sun-facing　wall　in　the　heating　&　curing　building.　The　PCM　board　is　heated　by　sun　rays　and　accumulates　thermal　energy　during　the　PCM＇s　phase　transition,　and　this　energy　then　is　released　to　the　indoor　environment　of　the　building,　reducing　the　amount　of　steam　required　to　maintain　a　certain　level　of　temperature　during　the　curing　process.　The　energy　consumption　simulation　software,　EnergyPlus,　and　two　physical　models　(built　on　the　scale　of　1:3)　were　used　to　study　the　effects　of　two　different　PCMs　on　the　thermal　performance　of　such　new　type　of　heating　&　curing　buildings.　Composite　PCMs　considered　were　GH-33　and　GH-37　with　33　and　37　degrees　C　melting　temperatures　developed　by　the　research　team.　The　theoretical　and　experimental　results　are　in　good　agreement　and　demonstrate　that,　compared　to　the　GH-33,　GH-37　PCM　increases　the　temperature　of　the　inner　surface　of　the　main　sun-facing　wall　and　the　upper　surface　temperature　of　the　PC　construction　element　by　3.4　and　1.4　degrees　C,　respectively.　The　heat　accumulation　and　discharge　rates　also　were　greater　by　62%.　For　the　investigated　design　of　the　building　and　given　location　in　China,　the　deployment　of　studied　PCM　wall　panels　results　in　a　reduction　in　the　annual　energy　consumption　and　CO2　emissions　by　58.6　GJ　and　5　tons,　respectively.　The　method　developed　for　applying　solar　energy　and　selecting　PCMs　for　augmenting　steam　curing　of　PC　construction　elements　can　be　deployed　in　different　geographical　regions.