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 ye-Energy yeSebe le-US ye-Energy kunye ne-EPA sele iqinisekisa ukusebenza kwe-thermal yeengcango kunye ne-Windows ukususela ngo-1989. I-NFRC, intlangano engenzi nzuzo eyamkele i-energy entsha ye-Fanestration Rating Council (NFRC) kunye neNkqubo yeNkwenkwezi ye-Energy yeSebe lezaMandla lase-US kunye ne-EPA sele iqinisekisa ukusebenza kwe-thermal yeengcango kunye ne-Windows ukususela ngo-1989. I-NFRC, umbutho ongenzi nzuzo owamkela amandla amatsha okusebenzisa amandla okusebenzisa amandla, i-label ye-US esebenza ngokuphindaphindiweyo kwi-20 ye-NFRC ifuna i-label yokusebenza kwe-20RC. iimveliso 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.