Exhibit 4(d)

                       COMMITMENT AMOUNT INCREASE REQUEST

                                November 21, 2005

Harris N.A.
    as Agent (the "AGENT")
    for the Lenders referred to below
111 West Monroe Street
Chicago, Illinois   60603

Attention: Joann Holman, Director

Re:
                      Amended and Restated Credit Agreement
                          dated as of October 14, 2005
             among EMCOR Group, Inc., the Lenders party thereto and
                              Harris N.A., as Agent
                   (as amended, modified or supplemented from
                     time to time, the "CREDIT AGREEMENT").
                     --------------------------------------


Ladies and Gentlemen:

        In accordance  with the Credit  Agreement,  the Company hereby  requests
that  the  Agent  consent  to an  increase  in the  aggregate  Commitments  (the
"COMMITMENT  AMOUNT  INCREASE"),  in accordance  with Section 1.10 of the Credit
Agreement,  to be effected by an increase in the  Commitment of Bank of Montreal
("BOM").  Capitalized  terms used herein without  definition shall have the same
meanings herein as such terms have in the Credit Agreement.

        After giving effect to such  Commitment  Amount  Increase,  and upon the
effectiveness of such Commitment Amount Increase,  the Commitment of BOM will be
as set forth on Attachment I hereto.

        On the date  hereof,  the  Company  agrees to pay to the Agent,  for the
account of BOM, a one-time,  non-refundable  upfront  fee in an amount  equal to
$6,250.

        THIS AGREEMENT SHALL BE DEEMED TO BE A CONTRACTUAL OBLIGATION UNDER, AND
SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE  WITH, THE LAWS OF THE STATE OF
ILLINOIS.

        The  Commitment  Amount  Increase  shall be effective  when the executed
consent of the Agent is received or otherwise in accordance with Section 1.10 of
the Credit  Agreement,  but not in any case prior to November 29, 2005. It shall
be a condition to the  effectiveness of the Commitment  Amount Increase that (i)
all fees and expenses  referred to in Section 1.10 of the Credit Agreement shall
have been paid and (ii) no Eurodollar  Loans shall be outstanding on the date of
such effectiveness.




        The  Company  hereby  certifies  that no Default or Event of Default has
occurred and is continuing.

        Please indicate the Agent's  consent to such Commitment  Amount Increase
by signing the enclosed copy of this letter in the space provided below.


                                        Very truly yours,

                                        EMCOR GROUP, INC.

                                        By:
                                           ----------------------------------
                                           Name:
                                                -----------------------------
                                           Title:
                                                 ----------------------------

                                        BANK OF MONTREAL

                                        By:
                                           ----------------------------------
                                           Name:
                                                -----------------------------
                                           Title:
                                                 ----------------------------


The undersigned hereby consents
On this 29th day of November, 2005
to the above-requested Commitment
Amount Increase.

HARRIS N.A.,
  as Agent

By:
   -----------------------------------------
   Name:
        ------------------------------------
   Title:
         -----------------------------------




                                  ATTACHMENT I


                  LENDER                                 COMMITMENT

            Bank of Montreal                             $30,000,000