We have prepared and tested integrated low-emittance-electrochromic devices using ZnS/Ag/ZnS coatings as transparent electrodes and WO3 films as electrochromic layers. These devices exhibit adequate coloration and can withstand more than 1000 bleaching-coloration cycles, provided that the metal layer is protected from the liquid electrolyte by a combination of thick dielectric films (ZnS/WO3). We have also predicted the optimum configuration of the WO3/ZnS/Ag/ZnS/Glass stack that maximizes transmission in the visible. Integration of low emittance and electrochromic films into one device could improve the performance and reduce the cost of electrochromic windows. (C) 2000 Elsevier Science B.V. All rights reserved.