Beware
They may do a minor check of your system with the intent of selling you a very expensive wet filter. We had that experience once with a check being done. The 'technician' wanted to see our filter even when I told him I had just replaced it. That was a clue about what he was up to.
A friend who was an ac man said if it is working well, do not touch it. Anoother friend lived in a home in Florida and did not touch his ac unit for 17 years and it was working fine when he sold the house. We change our filter on a regular basis, nothing else will be done unless we have a problem.
Charlie
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