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, mmelite nke nchekwa 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-egosi arụmọrụ thermal nke ọnụ ụzọ na Windows kemgbe 1989. NFRC, otu nzukọ anaghị akwụ ụgwọ nke nakweere akara ngosi ike oriri ọhụrụ nke 200 na-arụ ọrụ ceffirt na USC. ọnụ ụzọ 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.