Nthambi ya LEAWOD USA idapeza certification ya NFRC yapakhomo ndi zenera zapadziko lonse lapansi, LEAWOD yotsogola mwalamulo khomo ndi zenera zapadziko lonse lapansi.
Chifukwa cha kusowa kwa mphamvu, kuwongolera zofunikira zopulumutsa mphamvu pazitseko ndi Windows, National Fenestration Rating Council (NFRC) ndi Energy Star Programme ya US Department of Energy ndi EPA akhala akutsimikizira magwiridwe antchito a zitseko ndi Windows kuyambira pamenepo. 1989. NFRC, bungwe lopanda phindu lomwe lidatengera chizindikiro chatsopano cha Consumption performance label mu 2005, nthawi zambiri limafuna chiphaso cha NFRC chogwira ntchito bwino pazitseko ndi mawindo aku US. Kuphatikiza apo, chiphaso cha NFRC ndi gawo lofunikira ku chiphaso cha Energy Star. Gawo latsopano, LEAWOD idzapikisana ndi zitseko zabwino kwambiri zapadziko lonse lapansi ndi mabizinesi a Windows, bwerani, opangidwa ku China.