EXHIBIT 32.1

                            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 of EMCOR Group,  Inc. (the "Company")
on Form 10-K for the year ended  December 31, 2006 as filed with the  Securities
and Exchange Commission on the date hereof (the "Report"), I, Frank T. MacInnis,
Chief Executive Officer of the Company,  certify, pursuant to 18 U.S.C. ss.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  presents,  in all
material  respects,  the  financial  condition  and results of operations of the
Company.

Date: February 22, 2007                                /s/ FRANK T. MACINNIS
                                                     -------------------------
                                                      Chief Executive Officer