A professional  HVAC Preventative Maintenance (PM) Schedule ensures consistent performance, energy, and longevity of the heating and cooling systems. Thermal Limits Heating Cooling & Controls  L.L.C. Follows a structured PM program designed around seasonal needs and equipment type. Typically, maintenance is performed twice pre year - in the spring for the cooling system and in the fall for heating systems.  Each visit includes inspecting and cleaning coils, checking refrigeration levels, Testing electrical connections, Calibrating thermostats and controls, verifying airflow, and replacing filters as needed. For commercial clients, additional quarterly inspections may cover belt tension adjustments, lubrication of moving parts, drain line cleaning, and system performance testing. This proactive approach helps prevent costly breakdowns, ensures optimal comfort and maintains compliance with warranty and safety requirements while reducing overall operating cost.