Start with a quick assessment: unit age, model efficiency, recent failures, and energy bills. If repairs exceed a sensible percentage of replacement and the system is older, consider upgrade options with warranty-backed installs. A quality tune up should include coil cleaning, electrical tests, refrigerant verification, airflow checks, and thermostat calibration. Improve indoor air with better filtration, duct sealing, and smart thermostat setup thermostat scheduling. Document findings and compare quotes apples to apples. see our services