Regular maintenance is essential to ensure the optimal performance and longevity of display cases and merchandisers. Recommended maintenance schedules include daily cleaning of exterior and interior surfaces, weekly checks of temperature and humidity levels, and monthly inspections of door seals, gaskets, and electrical connections. Quarterly or bi-annual tasks may include defrosting, cleaning condenser coils, and replacing air filters. It is also essential to perform annual professional maintenance, including refrigerant leak detection and system performance evaluations.