Building　is　an　important　scenario　for　achieving　global　carbon　peak　and　carbon　neutrality　goals,accounting　for　approximately　37％of　global　energy-related　CO2　emissions　in　2020.In　the　meanwhile,the　construction　and　operation　of　buildings　was　responsible　for　36％of　global　energy　consumption,of　which　30％energy　was　used　for　space　heating.Therefore,this　paper　proposes　a　low-carbon　building　heating　system　that　is　coupled　to　a　new　semiconductor　radiation　heating　unit　and　distributed　rooftop　photovoltaic　to　reduce　carbon　emissions.To　reveal　its　building　heating　characteristics,a　dynamic　model　of　heat　transfer　based　on　semiconductor　low-temperature　radiant　heating　is　first　established　by　analyzing　the　heat　conduction,convection,and　radiation　models,and　the　uncertainty　from　both　the　distributed　rooftop　photovoltaic　and　building　heating　demand　is　considered　in　the　building　heating　operation　strategy.Then,a　simulation　model　of　a　low-carbon　building　heating　system　is　built　in　MATLAB/SIMULINK　for　two　different　climate　zones　in　China(Beijing　and　Wuhan).When　building　and　using　the　low-carbon　building　heating　system　stable　for　30　years,the　payback　period　is　5.2-8.2　years　in　Beijing　and　6.4-11.6　years　in　Wuhan.Compared　with　the　traditional　grid-powered　heating　system,the　simulation　revealed　that　the　carbon　emissions　of　Beijing　and　Wuhan　during　the　heating　season　are　reduced　by　44.9％and　44.3％,respectively,and　the　corresponding　building　heating　cost　is　saved　by　62.1％and　57.8％.