Make the first visit useful
Tell the technician how long it has been, whether cooling has changed, and whether you have noticed water, ice, noise, or rising electricity use. Ask for the maintenance checklist before booking. Find out whether cleaning, measurements, and any needed repairs are separate charges.
We would want this visit to establish a clear starting point: what is in good shape, what needs cleaning, what needs repair, and what should be watched. Ask for the findings in writing. A list of suggested parts without the reason for each part does not give you enough to decide.
Our recommendation could change if the exact manual calls for different care, the unit has an unusual operating schedule, or a technician finds a condition that needs earlier follow-up. Dust, pets, renovation work, and debris near the outdoor unit are useful details to share. They are not proof that a particular part has failed.
What you can keep up with
Trane recommends keeping registers, returns, and the outdoor unit's surrounding area clear for airflow. Trane homeowner care.
Follow your equipment instructions for its normal user-accessible filter. Ask which filter fits, how to check it, and what condition means it needs changing. Use a reminder to inspect it rather than assuming a calendar date always fits your home. Leave cabinet opening, electrical tests, and refrigerant work to a qualified technician.
If there is a cooling problem now, book a diagnostic visit and describe it. Routine maintenance and finding the cause of a failure are different jobs.
Your next step is one documented assessment, followed by a written care plan. That lets you decide based on this AC's needs instead of how long it has managed to run without help.