Ukunciphisa ukuqhutyelwa kobushushu:ibhulorho ekhusela ubushushu i-aluminiyam iprofayili ye-alloy'coefficient yi-1.8-3.5W/m2-k, engaphantsi kakhulu kuneeprofayili zealluminiyam eziqhelekileyo 140-170W/m2k; i-coefficient yokudlulisa ubushushu yi-3.17-3.59W/m2-- k kwisakhiwo seglasi esingenanto, esezantsi kakhulu kuneprofayili yealluminiyam eqhelekileyo ye-6.69-6.84W/m2-k, enciphisa ngokufanelekileyo ubushushu obuqhutywa ngeengcango kunye nobushushu obuqhutywa ngeengcango kunye neefestile.