Isebe le-LEAWOD lase-USA lifumene isiqinisekiso se-NFRC socango lwamazwe ngamazwe kunye nefestile, i-LEAWOD iqhubele phambili ngokusesikweni umnyango wamazwe ngamazwe kunye nophawu lwefestile phambili.
Ngokunyuka kokunqongophala kwamandla, ukuphuculwa kweemfuno zokulondoloza amandla kwiingcango kunye neWindows, i-National Fenestration Rating Council (NFRC) kunye neNkqubo yeNkwenkwezi yeNkwenkwezi yeSebe lezaMandla lase-US kunye ne-EPA sele iqinisekisa ukusebenza kwe-thermal yeengcango kunye neWindows ukususela. 1989. I-NFRC, umbutho ongenzi nzuzo owamkela ileyibhile entsha yokusetyenziswa kwamandla kwi-2005, isoloko ifuna isiqinisekiso se-NFRC sokusebenza kakuhle kwe-thermal kumnyango wase-US kunye neemveliso zefestile. Ukongeza, ukuqinisekiswa kwe-NFRC linyathelo eliyimfuneko ngokubhekiselele kwisatifikethi se-Energy Star. Inqanaba elitsha, i-LEAWOD iya kukhuphisana neengcango ezigqwesileyo zehlabathi kunye namashishini eWindows, enziwe eTshayina.