EXHIBIT 23.1

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

      We consent to the incorporation by reference in the Registration Statement
(Form S-8 No.  333-128840)  pertaining  to the 2005 Stock Plan for Directors and
the 2005 Management Stock Incentive Plan, the  Registration  Statement (Form S-8
No. 333-120078) pertaining to the Stock Option Agreement Dated as of October 25,
2004 and the Restricted  Share Unit Agreement  Dated as of October 25, 2004, the
Registration  Statement (Form S-8 No. 333-112940) pertaining to the Stock Option
Agreements dated as of January 4, 1999, May 5, 1999, January 3, 2000, January 2,
2001,  December 14,  2001,  January 2, 2002,  June 19,  2002,  October 25, 2002,
January 2, 2003,  February 27, 2003, and January 2, 2004, the 2003  Non-Employee
Directors'  Stock Option Plan, the 2003  Management  Stock  Incentive  Plan, the
Registration  Statement (Form S-8 No. 333-86600)  pertaining to the EMCOR Group,
Inc.  Stock Option  Agreements  dated as of January 4, 1999,  February 23, 1999,
January 3, 2000,  March 3, 2000,  January 2, 2001,  and December  17, 2001,  the
Registration   Statement  (Form  S-8  No.  333-75449)  pertaining  to  the  1997
Non-Employee Directors' Non-Qualified Stock Option Plan of EMCOR Group, Inc. and
the 1997  Stock  Plan for  Directors  of EMCOR  Group,  Inc.,  the  Registration
Statement  (Form S-8 No.  333-02819)  pertaining  to the 1994  Management  Stock
Option Plan of EMCOR Group, Inc. and 1995 Non-Employee Directors'  Non-Qualified
Stock Option Plan of EMCOR Group,  Inc., of our reports dated February 20, 2007,
with  respect to the  consolidated  financial  statements  and schedule of EMCOR
Group, Inc., EMCOR Group, Inc.  management's  assessment of the effectiveness of
internal  control over financial  reporting,  and the  effectiveness of internal
control over financial  reporting of EMCOR Group,  Inc.,  included in the Annual
Report (Form 10-K) for the year ended December 31, 2006.


Stamford, Connecticut                                 /S/ ERNST & YOUNG LLP
February 20, 2007