Sisitemu yicyatsi kibisi ikoreshwa cyane cyane igicucu kidasanzwe hamwe na sisitemu yo kubika ubushyuhe bwimbere, ikoresha ibikoresho byo kugicucu kugirango ikumire izuba ridakenewe, cyangwa gukora umwanya ufunze ukoresheje ibikoresho bya insula-tion.