Alaka LEAWOD USA nwetara asambodo ọnụ ụzọ na windo mba ụwa nke NFRC, LEAWOD nyekwara aka n'ihu ụlọ ọrụ ọnụ ụzọ na windo mba ụwa.
N'ihi ụkọ ike na-abawanye, mmezi nke ihe achọrọ maka ịchekwa ike maka ọnụ ụzọ na windo, National Fenestration Rating Council (NFRC) na Energy Star Program nke US Department of Energy na EPA anọwo na-akwado arụmọrụ okpomọkụ nke ọnụ ụzọ na windo kemgbe 1989. NFRC, otu nzukọ na-abụghị nke na-abụghị nke na-anabata akara arụmọrụ ike ọhụrụ na 2005, na-achọkarị asambodo arụmọrụ okpomọkụ NFRC maka ngwaahịa ọnụ ụzọ na windo US. Na mgbakwunye, asambodo NFRC bụ nzọụkwụ dị mkpa iji nweta asambodo Energy Star. N'ọkwa ọhụrụ, LEAWOD ga-asọmpi na ọnụ ụzọ na ụlọ ọrụ Windows dị mma n'ụwa, na China.