Overheating protection of solar thermal façades with latent heat storages based on paraffin-polymer compounds

•Latent heat storage as overheating protection device in solar thermal façade collector.•Development of high-temperature latent heat storage based on polymeric materials.•Integration of latent heat storage panels in insulation of solar thermal collector, comprehensive solar simulator testing and proof of concept.•Proof of application relevant overheating protection efficiency—enhancement of building thermal comfort.•Corroboration of theoretical modeling.