6 HVAC contractors in Saint Petersburg, Florida have held a state licence for twenty years or more. Licence age is a record of how long the state has licensed the contractor - it is not a rating, a review, or a guarantee of workmanship. Check the licence number and the discipline record on each listing, and get more than one written quote.
Not by itself. It means the contractor has held a Florida state licence continuously for at least twenty years. It says nothing about the quality of any individual job. 6 HVAC contractors in Saint Petersburg meet the twenty-year mark; compare their licence class and discipline record, and always get written quotes.