The answer to 'how to fix HVAC system' is to first identify the specific issue with your HVAC system. Common problems include dirty air filters, refrigerant leaks, thermostat malfunctions, and worn-out components. Once you've diagnosed the problem, you can often make simple repairs yourself, such as replacing air filters or resetting the thermostat. However, for more complex issues like refrigerant leaks or major component failures, it's best to call in a professional HVAC technician to ensure the problem is fixed safely and correctly.
Regular maintenance is also key to keeping your HVAC system running efficiently. You should have your system inspected and serviced by a professional at least once a year, typically in the spring or fall before peak usage seasons. This allows the technician to identify any potential issues and perform preventative maintenance to extend the life of your HVAC system.