Exhibit 99.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Watsco, Inc. (the
"Company") for the year ended December 31, 2002 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Albert H. Nahmad,
Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002,
that:

     (1)  The Report fully complies with the requirements of section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly present, in all
          material respects, the financial condition and results of operations
          of the Company.


/s/ Albert H. Nahmad
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Albert H. Nahmad
Chief Executive Officer
March 31, 2003