Document:

EXHIBIT 4.1(c)

EMCOR Group, Inc.

First Supplement to Pledge Agreement

          This
First Supplement to Pledge Agreement (the “Supplement”)is
dated as of this 21st day of November, 2011 among EMCOR Group, Inc. (the “Company”),
the other Pledgors party hereto, and Bank of Montreal, as collateral agent (the “Agent”).

Preliminary
Statements

          A. The
Pledgors listed under the heading “Existing Pledgors” on the signature pages
attached hereto and the Agent are party to that certain Third Amended and Restated
Pledge Agreement dated as of February 4, 2010 (such Pledge Agreement, as the
same may from time to time be amended, modified or restated, being hereinafter
referred to as the “Pledge Agreement”). All capitalized terms
used herein without definition shall have the same meanings herein as such
terms are defined in the Pledge Agreement.

          B. Pursuant to the Pledge Agreement, the
Existing Pledge granted to the Agent, for the benefit of the Secured Creditors,
among other things, a continuing security interest in certain equity interests
held by the Existing Pledgors as described therein.

          C.
Concurrently herewith, the Company, EMCOR Group (UK) plc., a United Kingdom
public limited company (“EMCOR UK”), Agent and certain other
parties are entering into a Third Amended and Restated Credit Agreement dated
as of even date herewith (such Credit Agreement, as the same may from time to
time be amended, modified or restated, being hereinafter referred to as the “Credit
Agreement”).

          D. The
Company wishes to (i) add certain of the Company’s subsidiaries listed under
the heading “Additional
Pledgors” on the signature pages attached hereto as Pledgors under
the Pledge Agreement (the “Additional Pledgors”; and together with
the Existing Pledgors, the “Pledgors”), (ii) update Schedule A
to the Pledge Agreement, and (iii) make certain other changes to the Pledge
Agreement and the Agent is willing to do so on the terms and conditions set
forth herein.

          E. The
Company and EMCOR UK provide the Pledgors (other than the Company) with
substantial financial, managerial, administrative, technical and design support
and the Pledgors will directly and substantially benefit from credit and other
financial accommodations extended and to be extended by the Secured Creditors
to the Company and EMCOR UK.

          Now,
Therefore, in consideration of the benefits accruing to the
Pledgors, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

          1. Each
Additional Pledgor acknowledges and agrees that it shall become a “Pledgor”
party to the Pledge Agreement effective upon the date such Additional Pledgor’s
execution of this Agreement and the delivery of this Agreement to the Agent,
and that upon such execution and delivery, all references in the Pledge
Agreement to the terms “Pledgor” or “Pledgors” shall be deemed to include such
Additional Pledgor. Each Additional Pledgor hereby acknowledges and agrees that
the Obligations are secured by all of the Pledged Securities according to, and
otherwise on and subject to, the terms and conditions of the Pledge Agreement
to the same extent and with the same force and effect as if such Additional
Pledgor had originally been one of the Existing Pledgors under the Pledge
Agreement and had originally executed the same as such an Existing Pledgor.

          2. Without
limiting the generality of the foregoing, the Pledgors hereby repeat and
reaffirm all grants (including the grant of a lien and security interest),
covenants, agreements, representations and warranties contained in the Pledge
Agreement as supplemented hereby, each and all of which are and shall remain
applicable to the Collateral from time to time owned by the Pledgors or in
which the Pledgors from time to time have any rights. Without limiting the
generality of the foregoing, the Pledgors hereby repeat and reaffirm all grants
(including the grant of a lien and security interest), covenants, agreements,
representations and warranties contained in the Pledge Agreement as
supplemented hereby, each and all of which are and shall remain applicable to
the Pledged Securities from time to time owned by the Pledgors or in which the
Pledgors from time to time have any rights. Without limiting the foregoing, in
order to secure payment of the Obligations, whether now existing or hereafter
arising, the Pledgors hereby grants to the Agent for the benefit of the Secured
Creditors, and hereby agree that the Agent has and shall continue to have for
the benefit of the Secured Creditors a continuing security interest in, among
other things, all of the Pledgors’ Pledged Securities (as such term is defined
in the Pledge Agreement) described in, and subject to the limitations set forth
in, Section 2 of the Pledge Agreement, each and all of such granting
clauses being incorporated herein by reference with the same force and effect
as if set forth in their entirety. Nothing contained herein shall in any manner
impair the priority of the liens and security interests heretofore granted in
favor of the Agent under the Pledge Agreement.

          3. The
foregoing notwithstanding, (i) references to Borrowers in the Pledge Agreement
shall be deemed to be references to the Company, EMCOR UK and any other
Subsidiary of the Company that is designated as a Borrower under the Credit
Agreement and (ii) references to the Credit Agreement in the Pledge Agreement
shall be deemed references to the Credit Agreement as defined herein.

          4. Schedule A to the Pledge Agreement shall be
amended and restated in the form of Schedule A attached hereto.

- 2 -

          5. The
Pledgors agree to execute and deliver such further instruments and documents
and do such further acts and things as the Agent may deem necessary or proper
to carry out more effectively the purposes of this Supplement.

          6. This
Supplement may be executed in any number of counterparts and by different
parties hereto on separate counterparts, each of which when so executed shall
be an original but all of which to constitute one and the same instrument.
Except as specifically amended and modified hereby, all of the terms and
conditions of the Pledge Agreement shall stand and remain unchanged and in full
force and effect.

          7. No reference
to this Supplement need be made in the Pledge Agreement or in any other
document or instrument making reference to the Pledge Agreement, any reference
to the Pledge Agreement in any of such items to be deemed a reference to the
Pledge Agreement as supplemented hereby. 

          8. This
Supplement shall be governed by and construed in accordance with the State of
Illinois (without regard to principles of conflicts of law).

 [Signature
Page Follows.] 

- 3 -

	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Dated as of the date first above written.

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  “Existing
 Pledgors”

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 EMCOR GROUP, INC.

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Anthony J. Guzzi

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 Anthony J. Guzzi

 
	
  

 	
  

 	
  

 	
 Title:

 	
 President and

 Chief Executive Officer

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 FORTI/POOLE AND KENT, L.L.C.

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Manager

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 CSUSA HOLDINGS L.L.C.

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Manager

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 TRIMECH PLUMBING L.L.C.

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Manager

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 SHAMBAUGH & SON, L.P.

 
	
  

 	
  

 	
 By: 

 	
 CSUSA Holdings L.L.C., its General Partner

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 

Signature Page to
Pledge Agreement Supplement

S-1

	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 BORDER ELECTRIC CO., L.P.

 
	
  

 	
  

 	
 By: 

 	
 CSUSA Holdings L.L.C., its General Partner

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 BORDER MECHANICAL CO., L.P.

 
	
  

 	
  

 	
 By: 

 	
 CSUSA Holdings L.L.C., its General Partner

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 PROFESSIONAL MECHANICAL
 CONTRACTORS, L.L.C.

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Welsbach Electric Corp.

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Keith D. Carney

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 Keith D. Carney

 
	
  

 	
  

 	
  

 	
 Title:

 	
 President / Chief Executive Officer

 

Signature Page to
Pledge Agreement Supplement

S-2

	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Air Systems, Inc.

 
	
  

 	
  

 	
 Atlantic Coast Mechanical, Inc.

 
	
  

 	
  

 	
 Beaumont Real Estate Holding Company

 
	
  

 	
  

 	
 Building Technology Engineers, Inc.

 
	
  

 	
  

 	
 Central Mechanical Construction Co., Inc.

 
	
  

 	
  

 	
 CES Facilities Management Services, Inc.

 
	
  

 	
  

 	
 Combustioneer Corporation

 
	
  

 	
  

 	
 Contra Costa Electric, Inc.

 
	
  

 	
  

 	
 CS48 Acquisition Corp.

 
	
  

 	
  

 	
 DeBra-Kuempel Inc. (f/k/a The Fred B. DeBra Co.)

 
	
  

 	
  

 	
 Design Air, Limited

 
	
  

 	
  

 	
 Duffy Mechanical Corp.

 
	
  

 	
  

 	
 Dyn Specialty Contracting, Inc.

 
	
  

 	
  

 	
 Dynalectric Company

 
	
  

 	
  

 	
 Dynalectric Company of Nevada

 
	
  

 	
  

 	
 Dynalectric Company of Ohio

 
	
  

 	
  

 	
 Dynalectric of Michigan II, Inc.

 
	
  

 	
  

 	
 EMCOR Construction Services, Inc. 

 
	
  

 	
  

 	
 EMCOR-CSI Holding Co.

 
	
  

 	
  

 	
 EMCOR Energy Services, Inc.

 
	
  

 	
  

 	
 EMCOR Facilities Services, Inc.

 
	
  

 	
  

 	
 EMCOR Government Services, Inc.

 
	
  

 	
  

 	
 EMCOR Gowan, Inc.

 
	
  

 	
  

 	
 EMCOR Hyre Electric Co. of Indiana, Inc.

 
	
  

 	
  

 	
 EMCOR International Inc.

 
	
  

 	
  

 	
 EMCOR Mechanical/Electrical Services (East), Inc.

 
	
  

 	
  

 	
 EMCOR Services Arizona, Inc.

 
	
  

 	
  

 	
 EMCOR Services Northeast, Inc.

 
	
  

 	
  

 	
 EMCOR Services New York/New Jersey, Inc.

 
	
  

 	
  

 	
 EMCOR Services Team Mechanical, Inc.

 
	
  

 	
  

 	
 F & G Management, Inc.

 
	
  

 	
  

 	
 F & G Plumbing, Inc.

 
	
  

 	
  

 	
 Fluidics, Inc.

 
	
  

 	
  

 	
 Forest Electric Corp.

 
	
  

 	
  

 	
 FR X Ohmstede Acquisitions Co.

 
	
  

 	
  

 	
 Gibson Electric Co., Inc.

 
	
  

 	
  

 	
 Great Monument Construction Company

 
	
  

 	
  

 	
 Hansen Mechanical Contractors, Inc.

 
	
  

 	
  

 	
 Heritage Mechanical Services, Inc.

 
	
  

 	
  

 	
 Hillcrest Sheet Metal, Inc.

 

Signature Page to
Pledge Agreement Supplement

S-3

	
  

 	
  

 	
  

 
	
  

 	
  

 	
 HNT Holdings Inc.

 
	
  

 	
  

 	
 HVAC, Ltd.

 
	
  

 	
  

 	
 Illingworth-Kilgust Mechanical, Inc.

 
	
  

 	
  

 	
 Inte-Fac Corp.

 
	
  

 	
  

 	
 J.C. Higgins Corp.

 
	
  

 	
  

 	
 KDC Inc.

 
	
  

 	
  

 	
 Kuempel Service, Inc.

 
	
  

 	
  

 	
 L.T. Mechanical, Inc.

 
	
  

 	
  

 	
 Labov Mechanical, Inc.

 
	
  

 	
  

 	
 Labov Plumbing, Inc.

 
	
  

 	
  

 	
 Lowrie Electric Company, Inc.

 
	
  

 	
  

 	
 Mandell Mechanical Corporation

 
	
  

 	
  

 	
 Marelich Mechanical Co., Inc.

 
	
  

 	
  

 	
 Maximum Refrigeration & Air Conditioning Corp.

 
	
  

 	
  

 	
 Meadowlands Fire Protection Corp.

 
	
  

 	
  

 	
 Mechanical Services of Central Florida, Inc.

 
	
  

 	
  

 	
 MES Holdings Corporation

 
	
  

 	
  

 	
 Mesa Energy Systems, Inc.

 
	
  

 	
  

 	
 Midland Fire Protection, Inc.

 
	
  

 	
  

 	
 Monumental Heating, Ventilating and Air Conditioning Contractors,
 Inc.

 
	
  

 	
  

 	
 Monumental Investment Corporation

 
	
  

 	
  

 	
 Nogle & Black Mechanical, Inc.

 
	
  

 	
  

 	
 North Jersey Mechanical Contractors, Inc.

 
	
  

 	
  

 	
 Ohmstede Industrial Services Inc.

 
	
  

 	
  

 	
 Pace Mechanical Services II, Inc.

 
	
  

 	
  

 	
 Penguin Air Conditioning Corp.

 
	
  

 	
  

 	
 Penguin Maintenance and Services Inc.

 
	
  

 	
  

 	
 Performance Mechanical, Inc.

 
	
  

 	
  

 	
 Poole & Kent Company of Florida

 
	
  

 	
  

 	
 Poole and Kent-New England, Inc.

 
	
  

 	
  

 	
 Poole and Kent-Connecticut, Inc.

 
	
  

 	
  

 	
 R. S. Harritan & Company, Inc.

 
	
  

 	
  

 	
 Redman Equipment & Manufacturing Company

 
	
  

 	
  

 	
 S. A. Comunale Co., Inc.

 
	
  

 	
  

 	
 The Betlem Service Corporation

 
	
  

 	
  

 	
 The Fagan Company

 
	
  

 	
  

 	
 The Poole and Kent Company

 
	
  

 	
  

 	
 The Poole and Kent Corporation

 
	
  

 	
  

 	
 Trautman & Shreve, Inc.

 
	
  

 	
  

 	
 University Marelich Mechanical, Inc.

 

Signature Page to
Pledge Agreement Supplement

S-4

	
  

 	
  

 	
  

 
	
  

 	
  

 	
 University Mechanical & Engineering Contractors, Inc., a
 California corporation

 
	
  

 	
  

 	
 University Mechanical & Engineering Contractors, Inc., an
 Arizona corporation

 
	
  

 	
  

 	
 Walker-J-Walker, Inc.

 
	
  

 	
  

 	
 WELSBACH ELECTRIC CORP. OF L.I.

 

	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By: 

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 F & G Mechanical
 Corporation

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By: 

 	
 /s/ Salvatore Fichera

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 Salvatore Fichera

 
	
  

 	
  

 	
  

 	
 Title:

 	
 President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Aircond Corporation

 
	
  

 	
  

 	
 MOR PPM, Inc.

 
	
  

 	
  

 	
 New England Mechanical
 Services, Inc.

 
	
  

 	
  

 	
 New England Mechanical
 Services of Massachusetts, Inc.

 
	
  

 	
  

 	
 Viox Services, Inc.

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Douglas Myers

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 Douglas Myers

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 OHMSTEDE PARTNERS LLC

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Manager

 

Signature Page to
Pledge Agreement Supplement

S-5

	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 OHMSTEDE HOLDINGS LLC

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Manager

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Ohmstede Ltd.

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 Ohmstede Partners LLC, its General Partner

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  “Additional
 Pledgors”

 
	
  

 
	
  

 	
  

 	
 Bahnson, Inc.

 
	
  

 	
  

 	
 Bahnson Holdings, Inc.

 
	
  

 	
  

 	
 Intermech, Inc.

 
	
  

 	
  

 	
 Mechanical Specialties
 Contractors, Inc.

 
	
  

 	
  

 	
 Scalise Industries
 Corporation

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 EMCOR Services CES, Inc.

 
	
  

 	
  

 	
 Harry Pepper &
 Associates, Inc.

 
	
  

 	
  

 	
 USM, Inc.

 
	
  

 	
  

 	
 USM (Delaware) Inc.

 
	
  

 	
  

 	
 USM Services Holdings, Inc.

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Douglas Myers

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 Douglas Myers

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Vice President

 

Signature Page to
Pledge Agreement Supplement

S-6

	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Bahnson Environmental
 Specialties, LLC

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:

 	
 R. Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:

 	
 Manager

 

Signature Page to
Pledge Agreement Supplement

S-7

	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Accepted and
 agreed to in Chicago, Illinois, as of the date first above written.

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 BANK OF   MONTREAL, as
 Agent

 
	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By  

 	
 /s/ John A. Armstrong

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name: John A. Armstrong

 
	
  

 	
  

 	
  

 	
 Title: Director

 

Signature Page to
Pledge Agreement Supplement

S-8

SCHEDULE A

THE PLEDGED SECURITIES

	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 PLEDGOR

 	
  

 	
 PLEDGED
 SECURITIES

 	
  

 	
 CERTIF. NO./NO. OF SHARES

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR Group, Inc.

 	
  

 	
 MES Holdings Corporation

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR 

 Mechanical/Electrical 

 Services (East), Inc.

 	
  

 	
 Inte-Fac Corp.

 	
  

 	
 No. 2

 	
  

 	
 200
 shares

 
	
  

 	
 Forest Electric Corp.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
 J.C. Higgins Corp.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
 Penguin Maintenance and Services Inc.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
 Penguin Air Conditioning Corp.

 	
  

 	
 No. A-5

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
 No. B-4

 	
  

 	
 500
 shares

 
	
  

 	
 Welsbach Electric Corp.

 	
  

 	
 No. 3

 	
  

 	
 100
 shares

 
	
  

 	
 Welsbach Electric Corp. of L.I.

 	
  

 	
 No. 5

 	
  

 	
 10
 shares

 
	
  

 	
 R. S. Harritan & Company, Inc.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
 Mandell Mechanical Corporation

 	
  

 	
 CS4

 	
  

 	
 100
 shares

 
	
  

 	
 Heritage Mechanical Services, Inc.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
 EMCOR Energy Services, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 J.C. Higgins Corp.

 	
  

 	
 Labov Mechanical, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
 Midland Fire Protection, Inc.

 	
  

 	
 No. 3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
 Professional Mechanical Contractors, LLC

 	
  

 	
 N/A

 	
  

 	
 N/A

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Labov Mechanical, Inc.

 	
  

 	
 Labov Plumbing, Inc.

 	
  

 	
 No. 2

 	
  

 	
 90
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
 No. 6

 	
  

 	
 10
 shares

 

- 1 -

	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 PLEDGOR

 	
  

 	
 PLEDGED
 SECURITIES

 	
  

 	
 CERTIF. NO./NO. OF SHARES

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR Construction

 	
  

 	
 EMCOR Mechanical/Electrical Services (East), Inc.

 	
  

 	
 No. 3

 	
  

 	
 100
 shares

 
	
 Services,
 Inc.

 	
  

 	
 EMCOR Hyre Electric Co. of Indiana, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Dyn Specialty Contracting, Inc.

 	
  

 	
 No. 8

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 University Mechanical & Engineering Contractors, Inc.

 	
  

 	
 No. 2021

 	
  

 	
 20
 shares

 
	
  

 	
  

 	
 Marelich Mechanical Co., Inc.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 University Marelich Mechanical, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Design Air, Limited

 	
  

 	
 No. 6

 	
  

 	
 550
 shares

 
	
  

 	
  

 	
 EMCOR Gowan, Inc.

 	
  

 	
 No. 4

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Duffy Mechanical Corp.

 	
  

 	
 No. 20

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Dynalectric Company of Ohio

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Dynalectric of Michigan II, Inc.

 	
  

 	
 No. 3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 DeBra-Kuempel Inc. (f/k/a The Fred B. DeBra Co.)

 	
  

 	
 No. 2-A

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 No. 4

 	
  

 	
 1,000
 shares

 
	
  

 	
  

 	
 Gibson Electric Co., Inc.

 	
  

 	
 No. 64B

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 S. A. Comunale Co., Inc.

 	
  

 	
 No. 67

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 No. 21

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Bahnson Holdings, Inc.

 	
  

 	
 No. 7

 	
  

 	
 10,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 No. P-5

 	
  

 	
 2,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Performance Mechanical, Inc.

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 University Mechanical
 & 

 Engineering Contractors, 

 Inc., a California corporation

 	
  

 	
 Hansen Mechanical Contractors, Inc.

 	
  

 	
 No. 33

 	
  

 	
 1,539
 shares

 
	
  

 	
 Pace Mechanical Services II, Inc.

 	
  

 	
 No. 5

 	
  

 	
 100
 shares

 
	
  

 	
 Trautman & Shreve, Inc.

 	
  

 	
 No. 3

 	
  

 	
 100
 shares

 
	
  

 	
 University Mechanical & 

 Engineering Contractors, Inc., 

 an Arizona corporation

 	
  

 	
 No. 5

 	
  

 	
 30,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 MES Holdings Corporation

 	
  

 	
 EMCOR Construction Services, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 EMCOR Facilities Services, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 EMCOR International, Inc.

 	
  

 	
 No. 7

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Monumental Investment Corporation

 	
  

 	
 No. AC14

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 EMCOR-CSI Holding Co.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Poole & Kent Company of

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 

- 2 -

	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 PLEDGOR

 	
  

 	
 PLEDGED
 SECURITIES

 	
  

 	
CERTIF. NO./NO. OF SHARES

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Florida

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR Facilities 

 Services, Inc.

 	
  

 	
 Building Technology
 Engineers, Inc.

 	
  

 	
 No. 4

 	
  

 	
 1,000
 shares

 
	
  

 	
 Mesa Energy Systems, Inc.

 	
  

 	
 No. 23

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 EMCOR Government Services,
 Inc.

 	
  

 	
 No. A8 

 	
  

 	
 13,585,000
 shares

 
	
  

 	
  

 	
 Air Systems, Inc.

 	
  

 	
 No. 7

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 EMCOR Services Northeast,
 Inc.

 	
  

 	
 No. 51

 	
  

 	
 2,500
 shares

 
	
  

 	
  

 	
 EMCOR Services New
 York/New Jersey, Inc.

 	
  

 	
 No. CS4

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Fluidics, Inc.

 	
  

 	
 No. 13

 	
  

 	
 99
 shares

 
	
  

 	
  

 	
 FR X Ohmstede Acquisitions
 Co.

 	
  

 	
 No. 3

 	
  

 	
 1,000
 shares

 
	
  

 	
  

 	
 EMCOR Services Arizona,
 Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 L.T. Mechanical, Inc.

 	
  

 	
 No. 15

 	
  

 	
 1,000
 shares

 
	
  

 	
  

 	
 Mechanical Services of
 Central Florida, Inc.

 	
  

 	
 No. 4

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 MOR PPM, Inc.

 	
  

 	
 No. 5

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 EMCOR Services CES, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Scalise Industries
 Corporation

 	
  

 	
 No. 5

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 USM Services Holdings,
 Inc.

 	
  

 	
 No. 3

 	
  

 	
 1,000
 shares

 
	
  

 	
  

 	
 Aircond Corporation

 	
  

 	
 No. 3

 	
  

 	
 5,000
 shares

 
	
  

 	
  

 	
 The Betlem Service Corporation

 	
  

 	
 No. 40

 	
  

 	
 640
 shares

 
	
  

 	
  

 	
 Combustioneer Corporation

 	
  

 	
 No. 12

 	
  

 	
 2,500
 shares

 
	
  

 	
  

 	
 EMCOR Services Team
 Mechanical, Inc.

 	
  

 	
 No. 4

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 New England Mechanical
 Services, Inc.

 	
  

 	
 No. 31

 	
  

 	
 54
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 (non-voting)

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
 No. 32

 	
  

 	
 559
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 (voting)

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Viox Services, Inc.

 	
  

 	
 No. 5

 	
  

 	
 1620
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 Class B non-voting common

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
 No. 6

 	
  

 	
 180
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 Class A voting common

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR Services New

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 York/New Jersey, Inc.

 	
  

 	
 Trimech Plumbing L.L.C.

 	
  

 	
 Class A Member 90%

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Dyn Specialty Contracting,
 

 Inc.

 	
  

 	
 Dynalectric Company

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
  

 	
 Dynalectric Company of
 Nevada

 	
  

 	
 No. 13

 	
  

 	
 166
 1/2 shares

 

- 3 -

	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 PLEDGOR

 	
  

 	
 PLEDGED
 SECURITIES

 	
  

 	
 CERTIF. NO./NO. OF SHARES

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Contra Costa Electric, Inc.

 	
  

 	
 No. 39

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 KDC Inc.

 	
  

 	
 No. 16

 	
  

 	
 8,333
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Monumental Investment

 	
  

 	
 The Poole and Kent Corporation

 	
  

 	
 No. 4

 	
  

 	
 5,000
 shares

 
	
 Corporation

 	
  

 	
 Poole and Kent Connecticut, Inc.

 	
  

 	
 No. 1

 	
  

 	
 10,000
 shares

 
	
  

 	
  

 	
 Poole and Kent New England, Inc.

 	
  

 	
 No. 4

 	
  

 	
 10,000
 shares

 
	
  

 	
  

 	
 Monumental Heating, 

 Ventilating and Air 

 Conditioning Contractors, Inc.

 	
  

 	
 No. 2

 	
  

 	
 1,000
 shares

 
	
  

 	
  

 	
 HVAC, Ltd.

 	
  

 	
 No. 2

 	
  

 	
 5,000
 shares

 
	
  

 	
  

 	
 The Poole and Kent Company

 	
  

 	
 No. 1

 	
  

 	
 5,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Monumental Heating,

 	
  

 	
 Forti/Poole and Kent LLC

 	
  

 	
 NA

 	
  

 	
 NA

 
	
 Ventilating and Air

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Conditioning Contractors,

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Inc.

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 HVAC, Ltd.

 	
  

 	
 Atlantic Coast Mechanical, Inc.

 	
  

 	
 No. 2

 	
  

 	
 50
 shares

 
	
  

 	
  

 	
 Great Monument Construction Company

 	
  

 	
 No. 2

 	
  

 	
 5,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR-CSI Holding Co.

 	
  

 	
 CSUSA Holdings L.L.C.

 	
  

 	
 NA

 	
  

 	
 NA

 
	
  

 	
  

 	
 Central Mechanical Construction Co., Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 F & G Mechanical Corporation

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 F & G Management, Inc.

 	
  

 	
 No. 2

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Hillcrest Sheet Metal, Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Illingworth-Kilgust Mechanical, Inc.

 	
  

 	
 No. CS4

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Kuempel Service, Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Lowrie Electric Company, Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Maximum Refrigeration and Air 

 Conditioning Corp.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Meadowlands Fire Protection Corp.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Nogle & Black Mechanical, Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 North Jersey Mechanical Contractors, Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 The Fagan Company

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Walker-J-Walker, Inc.

 	
  

 	
 No. CS3

 	
  

 	
 100
 shares

 

- 4 -

	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 PLEDGOR

 	
  

 	
 PLEDGED
 SECURITIES

 	
  

 	
CERTIF. NO./NO. OF SHARES

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 F & G Mechanical

 	
  

 	
 F & G Plumbing, Inc.

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
 Corporation

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 CSUSA Holdings L.L.C.

 	
  

 	
 Shambaugh & Son, L.P.

 	
  

 	
 General Partnership
 Interest

 
	
  

 	
  

 	
 Border Electric Co., L.P.

 	
  

 	
 General Partnership
 Interest

 
	
  

 	
  

 	
 Border Mechanical Co., L.P.

 	
  

 	
 General Partnership
 Interest

 
	
  

 	
  

 	
 CS48 Acquisition Corp.

 	
  

 	
 CS-3

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 CS48 Acquisition Corp.

 	
  

 	
 Shambaugh & Son, L.P.

 	
  

 	
 Limited Partnership
 Interest

 
	
  

 	
  

 	
 Border Electric Co., L.P.

 	
  

 	
 Limited Partnership
 Interest

 
	
  

 	
  

 	
 Border Mechanical Co., L.P.

 	
  

 	
 Limited Partnership
 Interest

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR International Inc.

 	
  

 	
 EMCOR (UK) Limited

 	
  

 	
 No. 10

 	
  

 	
 2,600,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR (UK) Limited

 	
  

 	
 EMCOR Group (UK) plc

 	
  

 	
 No. 11

 	
  

 	
 1,400,000

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 EMCOR Government 

 Services, Inc.

 	
  

 	
 CES Facilities Management 
Services, Inc.

 	
  

 	
 No. 2

 	
  

 	
 1,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Harry Pepper & Associates, Inc.

 	
  

 	
 No. 22

 	
  

 	
 410
 shares

 
	
  

 	
  

 	
  

 	
  

 	
 No. 24

 	
  

 	
 1600
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 New England Mechanical 

 	
  

 	
 New England Mechanical 

 	
  

 	
 No. 1

 	
  

 	
 100
 shares

 
	
 Services, Inc.

 	
  

 	
 Services of Massachusetts, Inc.

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 FR X Ohmstede Acquisitions
 

 Co.

 	
  

 	
 HNT Holdings Inc.

 	
  

 	
 No. 12

 	
  

 	
 238,799
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 HNT Holdings Inc.

 	
  

 	
 Ohmstede Partners LLC

 	
  

 	
 No. 1

 	
  

 	
 100
 units

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Ohmstede Holdings LLC

 	
  

 	
 No. 1

 	
  

 	
 100
 units

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Ohmstede Partners LLC

 	
  

 	
 Ohmstede Ltd.

 	
  

 	
 No. 1

 	
  

 	
 1
 unit

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Ohmstede Holdings LLC

 	
  

 	
 Ohmstede Ltd.

 	
  

 	
 No. 2

 	
  

 	
 99
 units

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Ohmstede Ltd.

 	
  

 	
 Ohmstede Industrial Services Inc.

 	
  

 	
 No. 19

 	
  

 	
 400
 shares

 
	
  

 	
  

 	
 Beaumont Real Estate Holding Company

 	
  

 	
 No. 1

 	
  

 	
 1000
 shares

 
	
  

 	
  

 	
 Redman Equipment &

 	
  

 	
 No. 87

 	
  

 	
 100
 shares

 
	
  

 	
  

 	
 Manufacturing Company

 	
  

 	
  

 	
  

 	
  

 

- 5 -

	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 PLEDGOR

 	
  

 	
 PLEDGED
 SECURITIES

 	
  

 	
 CERTIF. NO./NO. OF SHARES

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Bahnson Holdings, Inc.

 	
  

 	
 Bahnson, Inc.

 	
  

 	
 No. 1-A

 	
  

 	
 4,000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 Bahnson, Inc.

 	
  

 	
 Mechanical Specialties

 Contractors, Inc.

 	
  

 	
 No. 7

 	
  

 	
 2000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
   

 
	
  

 	
  

 	
 Intermech, Inc.

 	
  

 	
 No. 2

 	
  

 	
 5000
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 USM (Delaware) Inc.

 	
  

 	
 USM, Inc.

 	
  

 	
 No. 1

 	
  

 	
 1176
 shares

 
	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 	
  

 
	
 USM Services Holdings,
 Inc.

 	
  

 	
 USM (Delaware) Inc.

 	
  

 	
 No. 2

 	
  

 	
 1000
 shares

 

	
  

 	
  

 
	
  

 	
 Such
 Securities represent all of the issued and outstanding capital stock of each
 series and class of each issuer hereof and other equity interests of each
 issuer hereof except that EMCOR-CSI Holding Co. owns only 90% of the
 outstanding stock of F & G Mechanical Corporation. 

 

- 6 -EXHIBIT 4.1(d)

EMCOR GROUP,
INC.

REAFFIRMATION
AND

FIRST SUPPLEMENT TO GUARANTY AGREEMENT

          THIS
REAFFIRMATION AND FIRST SUPPLEMENT TO GUARANTY AGREEMENT (the “Supplement”)
is dated as of this 21st day of
November, 2011 among EMCOR Group, Inc. (the “Company”), and
the other Guarantors party hereto, in favor of Bank of Montreal, as agent (the “Agent”)
for the Guaranteed Creditors (as such term is defined in the Guaranty hereinafter
defined).

PRELIMINARY STATEMENTS

          A. The
Guarantors listed under the heading “Existing Guarantors” on the signature
pages hereto and the Agent are party to that certain Second Amended and
Restated Guaranty Agreement dated as of February 4, 2010 (such Guaranty
Agreement, as the same may from time to time be amended, modified or restated,
being hereinafter referred to as the “Guaranty”). All capitalized terms used
herein without definition shall have the same meanings herein as such terms are
defined in the Guaranty.

          B. Pursuant
to the Guaranty, the Existing Guarantors have guaranteed the full and prompt
payment of, among other things, any and all indebtedness, obligations and
liabilities of the Company and EMCOR Group (UK) plc., a United Kingdom public
limited company (“EMCOR UK”), arising under or relating to the Credit
Agreement and the other Loan Documents as described in the Guaranty.

          C.
Concurrently herewith, the Company, EMCOR UK, and certain other parties thereto
are entering into a Third Amended and Restated Credit Agreement dated as of
even date herewith (such Credit Agreement, as the same may from time to time be
amended, modified or restated, being hereinafter referred to as the “Credit
Agreement”), which amends and restates that certain Second Amended
and Restated Credit Agreement dated as of February 4, 2010, as amended, among
the Company, EMCOR UK, the lenders party thereto and Agent (the “Prior
Credit Agreement”).

          D. The
Company wishes to add certain of its Subsidiaries listed under the heading “Additional
Guarantors” on the signature pages attached hereto (such Additional
Guarantors together with the Existing Guarantors shall be hereinafter referred
to herein as the “Guarantors”) and make certain other changes to the Guaranty
and the Agent is willing to do so on the terms and conditions set forth herein.

          E. The
Company and EMCOR UK provides the Guarantors (other than the Company) with
substantial financial, managerial, administrative, technical and design support
and the Guarantors will directly and substantially benefit from credit and
other financial 

accommodations extended and to be extended by the Guaranteed Creditors
to the Company and EMCOR UK.

          NOW,
THEREFORE, in consideration of the benefits accruing to the
Guarantors, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

          1. Each
Additional Guarantor acknowledges and agrees that it shall become a “Guarantor”
party to the Guaranty effective upon the date such Additional Guarantor’s
execution of this Supplement and the delivery of this Supplement to the Agent
on behalf of the Guaranteed Creditors, and that upon such execution and
delivery, all references in the Guaranty to the terms “Guarantor” or “Guarantors”
shall be deemed to include such Additional Guarantor.

          2. Each
Additional Guarantor hereby assumes and becomes liable (jointly and severally
with all the other Guarantors) for the indebtedness hereby guaranteed (as
defined in the Guaranty) and agrees to pay and otherwise perform all of the
obligations of a Guarantor under the Guaranty according to, and otherwise on
and subject to, the terms and conditions of the Guaranty to the same extent and
with the same force and effect as if the such Guarantor had originally been one
of the Existing Guarantors under the Guaranty and had originally executed the
same as such an Existing Guarantor.

          3. Without
limiting the generality of the foregoing, each Guarantor acknowledges receipt
of a copy of the Credit Agreement and hereby consents to and agrees with all of
the terms, conditions and transactions contemplated thereunder and agrees that
the amendment and restatement of the Prior Credit Agreement shall have no
effect on the obligations of each Guarantor pursuant to the Guaranty.

          4. Each
Guarantor confirms that the Guaranty and all of such Guarantor’s obligations
thereunder remain in full force and effect and, without limiting the foregoing,
each Guarantor acknowledges and agrees that loans and advances and other credit
extended under the Credit Agreement shall constitute “indebtedness hereby guaranteed”,
as such term is defined in the Guaranty, and that is guaranteed by the
Guarantors under the Guaranty. All references to the terms “Credit Agreement” contained
in the Guaranty shall be deemed references to the terms “Credit Agreement” as
defined herein. All references to “Borrowers” contained in the Guaranty
shall be deemed references to the Company, EMCOR UK and any other subsidiary of
the Company that is designated as a Borrower under the Credit Agreement.

          5. Each
Guarantor hereby reaffirms all of the terms, provisions, agreements and
covenants contained in the Guaranty.

          6. The
Guarantors agree to execute and deliver such further instruments and documents
and do such further acts and things as the Agent may deem necessary or proper
to carry out more effectively the purposes of this Supplement.

          7. This
Supplement may be executed in any number of counterparts and by different
parties hereto on separate counterparts, each of which when so executed shall
be an original but 

- 2 -

all of which to constitute one and the same instrument. Except as
specifically amended and modified hereby, all of the terms and conditions of
the Guaranty shall stand and remain unchanged and in full force and effect.

          8. No
reference to this Supplement need be made in the Guaranty or in any other
document or instrument making reference to the Guaranty, and any reference to
the Guaranty in any of such items to be deemed a reference to the Guaranty as
supplemented hereby.

          9. This
Supplement shall be governed by and construed in accordance with the State of
Illinois (without regard to principles of conflicts of law).

[Signature
Page Follows.]

- 3 -

Dated as of
the date first above written.

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  “Existing Guarantors”

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 EMCOR Group,
 Inc.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Anthony
 J. Guzzi

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   Anthony
 J. Guzzi

 
	
  

 	
  

 	
  

 	
 Title:     President
 and

 
	
  

 	
  

 	
  

 	
               Chief
 Executive Officer

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Forti/Poole and Kent, L.L.C.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Manager

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 CSUSA
 Holdings L.L.C.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Manager

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Trimech
 Plumbing L.L.C.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Manager

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Shambaugh
 & Son, L.P.

 
	
  

 	
  

 	
 By: CSUSA
 Holdings L.L.C., its General Partner

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 

Signature Page to Guaranty Supplement

S-1

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Border
 Electric Co., L.P.

 
	
  

 	
  

 	
 By: CSUSA
 Holdings L.L.C., its General Partner

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:  R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Border
 Mechanical Co., L.P.

 
	
  

 	
  

 	
 By: CSUSA
 Holdings L.L.C., its General Partner

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Professional
 Mechanical Contractors, L.L.C.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Welsbach Electric Corp.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Keith D.
 Carney

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   Keith
 D. Carney

 
	
  

 	
  

 	
  

 	
 Title:     President
 / Chief Executive Officer

 

Signature Page to Guaranty Supplement

S-2

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Air Systems,
 Inc.

 
	
  

 	
  

 	
 Atlantic
 Coast Mechanical, Inc.

 
	
  

 	
  

 	
 Beaumont
 Real Estate Holding Company

 
	
  

 	
  

 	
 Building
 Technology Engineers, Inc.

 
	
  

 	
  

 	
 Central
 Mechanical Construction Co., Inc.

 
	
  

 	
  

 	
 CES
 Facilities Management Services, Inc.

 
	
  

 	
  

 	
 Combustioneer
 Corporation

 
	
  

 	
  

 	
 Contra Costa
 Electric, Inc.

 
	
  

 	
  

 	
 CS48
 Acquisition Corp.

 
	
  

 	
  

 	
 DEBRA-KUEMPEL
 INC. (f/k/a The Fred B. DeBra Co.)

 
	
  

 	
  

 	
 Design Air,
 Limited

 
	
  

 	
  

 	
 Duffy
 Mechanical Corp.

 
	
  

 	
  

 	
 Dyn
 Specialty Contracting, Inc.

 
	
  

 	
  

 	
 Dynalectric
 Company

 
	
  

 	
  

 	
 Dynalectric
 Company of Nevada

 
	
  

 	
  

 	
 Dynalectric
 Company of Ohio

 
	
  

 	
  

 	
 Dynalectric
 of Michigan II, Inc.

 
	
  

 	
  

 	
 EMCOR
 Construction Services, Inc.

 
	
  

 	
  

 	
 EMCOR-CSI
 Holding Co.

 
	
  

 	
  

 	
 EMCOR Energy
 Services, Inc.

 
	
  

 	
  

 	
 EMCOR
 Facilities Services, Inc.

 
	
  

 	
  

 	
 EMCOR
 Government Services, Inc.

 
	
  

 	
  

 	
 EMCOR Gowan,
 Inc.

 
	
  

 	
  

 	
 EMCOR Hyre
 Electric Co. of Indiana, Inc.

 
	
  

 	
  

 	
 EMCOR
 International Inc.

 
	
  

 	
  

 	
 EMCOR
 Mechanical/Electrical Services (East), Inc.

 
	
  

 	
  

 	
 EMCOR
 Services Arizona, Inc.

 
	
  

 	
  

 	
 EMCOR
 Services Northeast, Inc.

 
	
  

 	
  

 	
 EMCOR
 Services New York/New Jersey, Inc.

 
	
  

 	
  

 	
 EMCOR
 Services Team Mechanical, Inc.

 
	
  

 	
  

 	
 F & G
 Management, Inc.

 
	
  

 	
  

 	
 F & G
 Plumbing, Inc.

 
	
  

 	
  

 	
 Fluidics,
 Inc.

 
	
  

 	
  

 	
 Forest
 Electric Corp.

 
	
  

 	
  

 	
 FR X
 Ohmstede Acquisitions Co.

 
	
  

 	
  

 	
 Gibson
 Electric Co., Inc.

 
	
  

 	
  

 	
 Great
 Monument Construction Company

 
	
  

 	
  

 	
 Hansen
 Mechanical Contractors, Inc.

 
	
  

 	
  

 	
 Heritage
 Mechanical Services, Inc.

 
	
  

 	
  

 	
 Hillcrest
 Sheet Metal, Inc.

 

Signature Page to Guaranty Supplement

S-3

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 HNT Holdings
 Inc.

 
	
  

 	
  

 	
 HVAC, Ltd.

 
	
  

 	
  

 	
 Illingworth-Kilgust
 Mechanical, Inc.

 
	
  

 	
  

 	
 Inte-Fac
 Corp.

 
	
  

 	
  

 	
 J.C. Higgins
 Corp.

 
	
  

 	
  

 	
 KDC Inc.

 
	
  

 	
  

 	
 Kuempel
 Service, Inc.

 
	
  

 	
  

 	
 L.T.
 Mechanical, Inc.

 
	
  

 	
  

 	
 Labov
 Mechanical, Inc.

 
	
  

 	
  

 	
 Labov
 Plumbing, Inc.

 
	
  

 	
  

 	
 Lowrie
 Electric Company, Inc.

 
	
  

 	
  

 	
 Mandell
 Mechanical Corporation

 
	
  

 	
  

 	
 Marelich
 Mechanical Co., Inc.

 
	
  

 	
  

 	
 Maximum
 Refrigeration & Air Conditioning Corp.

 
	
  

 	
  

 	
 Meadowlands
 Fire Protection Corp.

 
	
  

 	
  

 	
 Mechanical
 Services of Central Florida, Inc.

 
	
  

 	
  

 	
 MES Holdings
 Corporation

 
	
  

 	
  

 	
 Mesa Energy
 Systems, Inc.

 
	
  

 	
  

 	
 Midland Fire
 Protection, Inc.

 
	
  

 	
  

 	
 Monumental
 Heating, Ventilating and Air Conditioning Contractors, Inc.

 
	
  

 	
  

 	
 Monumental
 Investment Corporation

 
	
  

 	
  

 	
 Nogle &
 Black Mechanical, Inc.

 
	
  

 	
  

 	
 North Jersey
 Mechanical Contractors, Inc.

 
	
  

 	
  

 	
 Ohmstede
 Industrial Services Inc.

 
	
  

 	
  

 	
 Pace
 Mechanical Services II, Inc.

 
	
  

 	
  

 	
 Penguin Air
 Conditioning Corp.

 
	
  

 	
  

 	
 Penguin
 Maintenance and Services Inc.

 
	
  

 	
  

 	
 Performance
 Mechanical, Inc.

 
	
  

 	
  

 	
 Poole &
 Kent Company of Florida

 
	
  

 	
  

 	
 Poole and
 Kent-New England, Inc.

 
	
  

 	
  

 	
 Poole and
 Kent-Connecticut, Inc.

 
	
  

 	
  

 	
 R. S.
 Harritan & Company, Inc.

 
	
  

 	
  

 	
 Redman
 Equipment & Manufacturing Company

 
	
  

 	
  

 	
 S. A.
 Comunale Co., Inc.

 
	
  

 	
  

 	
 The Betlem
 Service Corporation

 
	
  

 	
  

 	
 The Fagan
 Company

 
	
  

 	
  

 	
 The Poole
 and Kent Company

 
	
  

 	
  

 	
 The Poole
 and Kent Corporation

 
	
  

 	
  

 	
 Trautman
 & Shreve, Inc.

 
	
  

 	
  

 	
 University
 Marelich Mechanical, Inc.

 

Signature Page to Guaranty Supplement

S-4

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 University
 Mechanical & Engineering Contractors, Inc., a California corporation

 
	
  

 	
  

 	
 University
 Mechanical & Engineering Contractors, Inc., an Arizona corporation

 
	
  

 	
  

 	
 Walker-J-Walker,
 Inc.

 
	
  

 	
  

 	
 Welsbach
 Electric Corp. of L.I.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 F & G
 Mechanical Corporation

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/
 Salvatore Fichera

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   Salvatore
 Fichera

 
	
  

 	
  

 	
  

 	
 Title:     President

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Aircond
 Corporation

 
	
  

 	
  

 	
 MOR PPM,
 Inc.

 
	
  

 	
  

 	
 New England
 Mechanical Services, Inc.

 
	
  

 	
  

 	
 New England
 Mechanical Services of Massachusetts, Inc.

 
	
  

 	
  

 	
 Viox Services,
 Inc.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Douglas
 Myers

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   Douglas
 Myers

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Ohmstede
 Partners LLC

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Manager

 
	
  

 	
  

 	
  

 

Signature Page to Guaranty Supplement

S-5

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Ohmstede
 Holdings LLC

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	
 Title:     Manager

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Ohmstede
 Ltd.

 
	
  

 	
  

 	
 By: Ohmstede
 Partners LLC, its General Partner

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
  “Additional Guarantors”

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Bahnson,
 Inc.

 
	
  

 	
  

 	
 Bahnson
 Holdings, Inc.

 
	
  

 	
  

 	
 Intermech,
 Inc.

 
	
  

 	
  

 	
 Mechanical
 Specialties Contractors, Inc.

 
	
  

 	
  

 	
 Scalise
 Industries Corporation

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 EMCOR
 Services CES, Inc.

 
	
  

 	
  

 	
 Harry Pepper
 & Associates, Inc.

 
	
  

 	
  

 	
 USM, Inc.

 
	
  

 	
  

 	
 USM
 (Delaware) Inc.

 
	
  

 	
  

 	
 USM Services
 Holdings, Inc.

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ Douglas
 Myers

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   Douglas
 Myers

 
	
  

 	
  

 	
  

 	
 Title:     Vice
 President

 

Signature Page to Guaranty Supplement

S-6

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Bahnson
 Environmental Specialties, LLC

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By:

 	
 /s/ R. Kevin
 Matz

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name:   R.
 Kevin Matz

 
	
  

 	
  

 	
  

 	
 Title:     Manager

 

Signature Page to Guaranty Supplement

S-7

	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 Accepted and
 agreed to in Chicago, Illinois, as of the date first above written.

 
	
  

 	
  

 	
  

 
	
  

 	
  

 	
 BANK OF
 MONTREAL, as Agent

 
	
  

 	
  

 	
  

 	
  

 
	
  

 	
  

 	
 By

 	
 /s/ John A.
 Armstrong

 
	
  

 	
  

 	
  

 	

 

 
	
  

 	
  

 	
  

 	
 Name: John A. Armstrong

 
	
  

 	
  

 	
  

 	
 Title: Director

 

Signature Page to Guaranty Supplement

S-8

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00196-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00196-of-00352.parquet"}]]