Alaka LEAWOD USA nwetara asambodo ọnụ ụzọ mba ụwa na NFRC, LEAWOD gbagoro n'ihu n'ihu ụzọ mba ụwa na akara windo.
Site na ụkọ ike na-abawanye ụba, nkwalite nke nchekwa ike chọrọ maka ọnụ ụzọ na Windows, National Fenestration Rating Council (NFRC) na Energy Star Programme nke US Department of Energy na EPA anọwo na-akwado arụmọrụ ọkụ nke ọnụ ụzọ na Windows kemgbe. 1989. NFRC, otu anaghị akwụ ụgwọ nke nakweere akara ngosi arụmọrụ ike ọhụrụ na 2005, na-achọkarị asambodo nrụpụta ọkụ NFRC maka ọnụ ụzọ US na ngwaahịa windo. Na mgbakwunye, asambodo NFRC bụ nzọụkwụ dị mkpa maka asambodo Energy Star. The ọhụrụ ogbo, LEAWOD ga-asọmpi na ụwa magburu onwe ụzọ na Windows ụlọ ọrụ, bịa, mere na China.