The answer to 'preventive maintenance not cooling' is that a lack of proper preventive maintenance is a common cause of an HVAC system not cooling effectively. Symptoms may include warm air blowing from the vents, the system running constantly, or the home not reaching the desired temperature. Solutions can include cleaning or replacing air filters, clearing debris from the outdoor unit, and scheduling professional maintenance to inspect and tune up the system.
Preventive maintenance is crucial for keeping an HVAC system running efficiently and avoiding more costly repairs down the line. While some basic tasks like changing air filters can be done by homeowners, it's generally best to have a professional HVAC technician perform a comprehensive tune-up and inspection annually to ensure the system is operating at peak performance.