Emergency service refers to the repair work that needs to be done on an HVAC system when it suddenly stops working or malfunctions in a way that affects its performance or safety. Emergency service may be required due to a number of issues, including a breakdown of components, leaks in refrigerant lines, or electrical problems. HVAC emergency service is typically provided on an urgent basis and is designed to quickly restore the system to full functionality to prevent any further damage or safety issues. On the other hand, maintenance is the proactive, ongoing care and attention given to an HVAC system to keep it running efficiently and effectively. Regular maintenance involves a scheduled inspection and cleaning of the HVAC system to identify and address any potential problems before they become major issues. This includes replacing air filters, checking refrigerant levels, inspecting electrical components, cleaning coils, and ensuring proper system operation.