In　response　to　global　climate　change,　achieving　sustainable　development　through　energy　conservation　and　emission　reduction　has　become　a　common　goal　for　humanity.　In　this　work,　we　present　a　general　model　for　computing　the　energy　consumption　and　carbon　emissions　of　building　with　low　computational　complexity　and　effort.　Based　on　this　model,　we　designed　smart　green　building　walls　(SGBW),　which　consist　of　conventional　walls　and　thermal　storage/release　films　applied　to　their　external/internal　surfaces.　These　films,　which　incorporate　thermochromic　materials　can　adaptively　adjust　their　radiation　properties　according　to　environmental　temperature.　At　high　temperatures,　the　thermal　storage　film(TSF)　absorbs　heat　utilizing　a　solar　absorptance　of　0.604　and　storing　the　heat　within　the　wall.　Conversely,　at　low　temperatures,　the　thermal　release　film(TRF)　unidirectionally　releases　heat　into　the　interior　with　an　infrared　emissivity　of　0.821.　The　simulation　results　indicate　that　SGBW　has　enhanced　heat　storage　capacity　by　18.7　%　and　increased　heat　release　capacity　by　30.4　%　compared　to　conventional　cement　walls.　In　addition,　calculations　using　the　general　model　show　that　each　square　meter　of　SGBW　can　save　417　805　kWh　of　electricity　and　reduces　CO2　emissions　by　225　477　kg　over　the　building＇s　lifecycle　in　various　climatic　zones,　aligning　closely　with　results　obtained　from　the　commercial　software.　Thus,　this　model　not　only　simplifies　intricate　simulation　processes　but　also　serves　as　a　guide　for　designing　surface　devices.　The　SGBW　is　anticipated　to　be　particularly　beneficial　in　buildings　located　in　regions　requiring　nighttime　heating,　contributing　significantly　to　indoor　temperature　regulation　while　simultaneously　reducing　energy　consumption　and　carbon　emissions.