Did the tech show you the mold (in person, pics from of the inside your unit, etc) or did he just indicate it on paperwork or in passing conversation?
Its not uncommon in older units and while UV lights work to kill mold off quickly & easily and are fairly inexpensive, if it were me, I wouldn't just sign off on the need for one without confirming it was a problem in My specific unit and getting more than one cost estimate, if you do not want the hassle of dropping one in yourself.
Dry mold can go airborne and become reactive with moisture, so it maybe best to not avoid the issue, just confirm it with another inspection/AC company to which you are present for and can confirm for yourself...too many scams around TV to take anyone person or company at there word.
Good luck.
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