Recently, I completed a comprehensive heating and air conditioning repair service for a client. Upon arrival, I conducted a thorough inspection of the HVAC system to identify any issues. I discovered a malfunctioning thermostat and a clogged air filter, both of which were contributing to the system's inefficiency. I replaced the faulty thermostat and cleaned the air filter to ensure optimal performance. Additionally, I checked the refrigerant levels and found them to be low, so I refilled them to the appropriate level. After completing these repairs, I tested the system to confirm that it was functioning correctly and provided the client with maintenance tips to prolong the life of their HVAC system.