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 yokusetyenziswa kwamandla ifuna ileyibhile yokusebenza kwe-US, rhoqo kwi-20 ye-NFRC ye-20 umnyango we-NFRC 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.