Refrigeration accounts for about 60% of the electric bill in a convenience store. Evaporator fan replacement with two speed ECM motors were added to reduce fan energy by 92%. During this process, it was discovered that four of the fans were spinning in the wrong direction. This was causing icing on the coils and constant compressor problems. The coils were also very dirty and were cleaned during the installation. In addition, a cold air economizer was added to utilize outside air in the winter. This replaces refrigeration for approximately 138 days a year.