Abubuwan dumama ruwan yumbu da aka gina da waya mai dumama, farantin insulation na mica, bakin karfe da bakin karfe mara sumul, Ana iya finned don inganta canjin zafi. An ƙera fins na musamman don samar da matsakaicin tuntuɓar ƙasa don kyakkyawar ɓarkewar zafi a cikin sassan giciye da aka keɓe, don haka yana haifar da saurin zafi zuwa iska.