; ▁there ▁was ▁a ▁basic ▁misunder standing ▁of ▁the ▁difference ▁between ▁mass ▁and ▁ins ulation . ▁Good ▁ins ulation ▁res ists ▁the ▁passage ▁of ▁heat ; ▁thermal ▁mass ▁does ▁the ▁opposite , ▁it ▁absor bs ▁heat . ▁Test ing ▁has ▁shown ▁that ▁the ▁ram med ▁earth ▁used ▁in ▁the ▁Lor ena ▁st ove ▁absor bs ▁heat ▁that ▁should ▁be ▁directed ▁toward ▁cook ing . ▁ ▁However , ▁this ▁" w aste " ▁heat ▁radi ates ▁into ▁the ▁structure , ▁providing ▁more ▁efficient ▁he ating ▁than ▁an ▁open ▁fire ▁( a ▁dis adv antage ▁in ▁hot ▁weather ). ▁A ▁Lor ena ▁st ove ▁can ▁also ▁be ▁used ▁to ▁dry ▁clothes ▁as ▁its ▁mass ▁slowly ▁co ols ▁off ▁after ▁the ▁fire ▁dies . ▁ ▁The ▁design ers , ▁A pro ve cho , ▁now ▁state : ▁" The ▁Lor ena ▁has ▁been ▁tested ▁over ▁the ▁years ▁by ▁many ▁research ers ▁and ▁has ▁generally ▁been ▁found ▁to ▁use ▁more ▁fire wood ▁than ▁an ▁ind oor ▁open ▁fire . ▁The ▁st ove ▁has ▁other ▁attributes . ▁Its ▁chim ney ▁takes ▁smoke ▁out ▁of ▁the ▁kitchen ▁and ▁it ▁is ▁well ▁liked . ▁It ▁is ▁pretty ▁and ▁a ▁nice ▁addition ▁to ▁the ▁house . ▁It ▁is ▁low ▁cost ▁and ▁can ▁be ▁rep a ired ▁and ▁even ▁built ▁by ▁the ▁home ▁owner . ▁But , ▁it ▁is ▁not ▁a ▁fuel ▁saving ▁or ▁low ▁emission ▁st ove ". ▁In ▁later ▁designs , ▁the ▁ram med ▁earth ▁has ▁been ▁replaced ▁with ▁thermal ▁ins ulation , ▁such ▁as ▁p um ice ▁or ▁ash