The Inner Sanctuary of the Prophet Salaahu Alaihi Wasallam

The Prophet Salaahu Alaihi Wasallam lived in Medina. His roof was made only out of intertwined leaf palms, which meant it wasn't watertight or waterproof. The two inner doors that were used are also not solid but just a curtain. So clearly there must have been some type of wall to protect the processm from the cold.