Document:

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                                                                    EXHIBIT 10.1

                              EMPLOYMENT AGREEMENT

         THIS EMPLOYMENT AGREEMENT (this "Agreement") between COMFORT SYSTEMS
USA, INC., a Delaware corporation (referred to herein individually as "Comfort"
and collectively with its subsidiaries and affiliates as the "Company"), and
David Lanphar ("Executive") is entered into and effective as of the 1st day of
September, 2001. This Agreement supersedes any other employment agreements or
understandings, written or oral, between the Company and Executive.

                                 R E C I T A L S

         The following statements are true and correct:

                  As of the date of this Agreement, the Company is engaged in
         the business of mechanical contracting services, including heating,
         ventilation and air conditioning, plumbing, piping, electrical and
         related services ("Services").

                  Executive is employed hereunder by the Company in a
         confidential relationship wherein Executive, in the course of
         Executive's employment with the Company, has and will continue to
         become familiar with and aware of information as to the Company's and
         its customers' specific manner of doing business, including the
         processes, techniques and trade secrets utilized by the Company, and
         future plans with respect thereto, all of which has been and will be
         established and maintained at great expense to the Company. This
         information is a trade secret and constitutes the valuable goodwill of
         the Company.

         NOW, THEREFORE, in consideration of the mutual promises, terms,
covenants and conditions set forth herein and the performance of each, the
Company and Executive hereby agree as follows:

                               A G R E E M E N T S

         1. Employment and Duties.

                  (a) The Company hereby employs Executive in an executive
         position and Executive hereby accepts this employment upon the terms
         and conditions herein contained. Executive agrees to devote
         substantially all of Executive's business time, attention and efforts
         to promote and further the business of the Company.

                  (b) Executive shall faithfully adhere to, execute and fulfill
         all lawful policies established by the Company, including the Company's
         Corporate Compliance Policy.

                  (c) Executive shall not, during the term of Executive's
         employment hereunder, be engaged in any other business activity pursued
         for gain, profit or other pecuniary advantage if such activity
         interferes in any material respect with Executive's

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         duties and responsibilities hereunder. The foregoing limitations shall
         not be construed as prohibiting Executive from making personal
         investments in such form or manner as will neither require Executive's
         services in the operation or affairs of the companies or enterprises in
         which such investments are made nor violate the terms of Section 4
         hereof.

         2. Compensation. For all services rendered by Executive, the Company
shall compensate Executive as follows:

                  (a) Base Salary. Effective the date hereof, the base salary
         payable to Executive shall be $175,000 per year, payable on a regular
         basis in accordance with the Company's standard payroll procedures, but
         not less often than monthly.

                  (b) Executive Perquisites, Benefits and Other Compensation.
         Executive shall be entitled to receive additional benefits and
         compensation from the Company in such form and to the extent specified
         below:

                           (i) Coverage, subject to contributions required of
                  employees generally, for Executive and Executive's dependent
                  family members under health, hospitalization, disability,
                  dental, life and other insurance plans that the Company may
                  have in effect from time to time for the benefit of its
                  employees.

                           (ii) Reimbursement for all business travel and other
                  out-of-pocket expenses reasonably incurred by Executive in the
                  performance of Executive's services pursuant to this
                  Agreement. Reimbursable expenses shall be appropriately
                  documented in reasonable detail by Executive, and shall be in
                  a format consistent with the Company's expense reporting
                  policy.

                  (c ) Relocation. Employee has agreed that he will relocate his
         primary residence to the Houston, Texas area within six months of the
         date of this agreement. Company has agreed in consideration of such
         relocation that it will (i) reimburse employee up to an aggregate
         maximum of $35,000 for costs actually incurred in connection with such
         relocation (employee may apply up to one half of such amount to procure
         temporary accommodations in Houston prior to such relocation), and (ii)
         Company will pay to Executive a bonus equal to one year of base salary
         within twenty business days of the definitive and final closing of any
         change of control of Comfort Systems USA, Inc. (a transaction that
         results in the sale of a majority of the Comfort's voting capital stock
         or substantially all of Comfort's assets).

         3. Confidentiality.

                  (a) Confidential Information. As used herein, the term
         "Confidential Information" means any information, technical data or
         know-how of the Company, including, but not limited to, that which
         relates to customers, business affairs, business plans, financial
         matters, financial plans and projections, pending and proposed
         acquisitions, operational and hiring matters, contracts and agreements,
         marketing, sales

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         and pricing, prospects of the Company, and any information, technical
         data or know-how that contain or reflect any of the foregoing, whether
         prepared by the Company, Executive or any other person or entity;
         provided, however, that the term "Confidential Information" shall not
         include information, technical data or know-how that Executive can
         demonstrate is generally available to the public not as a result of any
         breach of this Agreement by Executive.

                  (b) No Disclosure. Except in the performance of Executive's
         duties as an employee of the Company, Executive will not, during or
         after the term of Executive's engagement with the Company, disclose to
         any person or entity or use, for any reason whatsoever, any
         Confidential Information.

         4. Non-Competition Agreement.

                  (a) Competition. Executive will not, during the period of
         Executive's employment by or with the Company, and for a period of
         twelve months immediately following the termination of Executive's
         employment, for any reason whatsoever, directly or indirectly, on
         behalf of Executive or on behalf of or in conjunction with any other
         person, company, partnership, corporation or business of whatever
         nature:

                           (i) engage, as an officer, director, shareholder,
                  owner, partner, joint venturer, or in a managerial capacity,
                  whether as an employee, independent contractor, consultant or
                  advisor, or as a sales representative, or make or guarantee
                  loans or invest in or for any business engaged in Services in
                  competition with the Company within 100 miles of where the
                  Company conducts or has conducted business during the Term
                  (the "Territory");

                           (ii) call upon any person who is, at that time,
                  within the Territory, an employee of the Company in a
                  technical, managerial or sales capacity for the purpose or
                  with the intent of enticing such employee away from or out of
                  the employ of the Company;

                           (iii) call upon any person or entity which is, at
                  that time, or which has been, within two (2) years prior to
                  that time, a customer of the Company for the purpose of
                  soliciting or selling Services;

                           (iv) call upon any prospective acquisition candidate,
                  on Executive's own behalf or on behalf of any competitor,
                  which candidate was either called upon by the Executive on
                  behalf of the Company or for which the Executive made an
                  acquisition analysis on behalf of the Company for the purpose
                  of acquiring such entity.

         Notwithstanding the above, the foregoing covenants shall not be deemed
         to prohibit Executive from acquiring as an investment not more than one
         percent (1%) of the capital

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         stock of a competing business whose stock is traded on a national
         securities exchange or on an over-the-counter or similar market.

                  (b) No Violation. It is specifically agreed that the period
         during which the agreements and covenants of Executive made in this
         Section 4 shall be effective shall be computed by excluding from such
         computation any time during which Executive is in violation of any
         provision of this Section 4.

         5. Term; Termination; Rights on Termination. The term of this Agreement
shall begin on the date hereof and continue for two (2) (the "Term"), unless
terminated sooner as herein provided. Beginning on the second anniversary and
thereafter on each anniversary this Agreement shall renew for consecutive
one-year terms unless either party shall give the other notice at least 30 days
prior to such anniversary. This Agreement and Executive's employment may be
terminated in any one of the following ways:

                  (a) Death. The death of Executive shall immediately terminate
         this Agreement with no severance compensation due to Executive's
         estate.

                  (b) Disability. If, as a result of incapacity due to physical
         or mental illness or injury, Executive shall have been absent from
         Executive's full-time duties hereunder for four (4) consecutive months,
         then thirty (30) days after receiving written notice (which notice may
         occur before or after the end of such four (4) month period, but which
         shall not be effective earlier than the last day of such four (4) month
         period), the Company may terminate Executive's employment hereunder,
         provided Executive is unable to resume Executive's full-time duties at
         the conclusion of such notice period. In the event this Agreement is
         terminated as a result of Executive's disability, Executive shall
         receive from the Company Executive's base salary at the rate then in
         effect for the lesser of the time period remaining under the Term of
         this Agreement or for one (1) year, and such amount shall be payable
         during such period in a manner consistent with Company's standard pay
         practices. The amount payable hereunder shall be decreased by the
         amount of benefits otherwise actually paid by the Company to Executive
         or on Executive's behalf or under any insurance procured by the
         Company.

                  (c) Good Cause. The Company may terminate this Agreement ten
         (10) days after written notice to Executive for good cause, which shall
         include any of the following: (i) Executive's willful or material
         breach of this Agreement; (ii) Executive's failure to perform any of
         his material duties following notice by the Company to Executive of
         such improper performance and Executive's failure to correct the
         improper performance to the satisfaction of the Company within a
         reasonable time; (iii) Executive's gross negligence in the performance
         or intentional nonperformance of any of Executive's material duties and
         responsibilities hereunder; (iv) Executive's willful dishonesty, fraud
         or misconduct with respect to the business or affairs of the Company or
         any other member of the Comfort Group; (v) Executive's conviction of a
         felony crime; (vi) Executive's confirmed positive illegal drug test
         result; (vii) sexual harassment by Executive; or (viii) willful or
         material failure by Executive to comply with Comfort's Corporate
         Compliance Policy or

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         other Company policies. In the event of a termination for good cause,
         as enumerated above, Executive shall have no right to any severance
         compensation.

                  (d) Without Cause. At any time after the commencement of
         Executive's employment, Executive or the Company may, without cause,
         terminate this Agreement and Executive's employment, effective thirty
         (30) days after receipt of written notice. Should Executive be
         terminated by the Company without cause, Executive shall receive from
         the Company Executive's base salary at the rate then in effect for one
         (1) year, and such amount shall be payable during such period in a
         manner consistent with the Company's standard pay practices.

         6. Return of Company Property. All records, plans, manuals, "field
guides", memoranda, lists, documents, statements and other property delivered to
Executive by or on behalf of the Company, by any customer of the Company
(including but not limited to, any such customers obtained by Executive), by any
acquisition candidate of the Company, and all records compiled by Executive
which pertain to the business or activities of the Company shall be and remain
the property of the Company and shall be subject at all times to its discretion
and control. Likewise, all correspondence with customers, representatives or
acquisition candidates, reports, records, charts, advertising materials, and any
data collected by Executive, or by or on behalf of the Company or any
representative of the Company shall be delivered promptly to the Company without
request by it upon termination of Executive's engagement with the Company.

         7. Inventions. Executive shall disclose promptly to the Company any and
all significant conceptions and ideas for inventions, improvements and valuable
discoveries, whether patentable or not, which are conceived or made by
Executive, solely or jointly with another, during the period of Executive's
employment or within one (1) year thereafter, and which are directly related to
the business or activities of the Company or which Executive conceives as a
result of Executive's employment by the Company. Executive hereby assigns and
agrees to assign all Executive's interests therein to the Company or its
nominee. Whenever requested to do so by the Company, Executive shall execute any
and all applications, assignments or other instruments that the Company shall
deem necessary to apply for and obtain Letters Patent of the United States or
any foreign country or to otherwise protect the Company's interest therein.

         8. Trade Secrets. Executive agrees that Executive will not, during or
after the Term, disclose the specific terms of the Company's relationships or
agreements with significant vendors or customers or any other significant and
material trade secret of the Company, whether in existence or proposed, to any
person, firm, partnership, corporation or business for any reason or purpose
whatsoever.

         9. No Prior Agreements. Executive hereby represents and warrants to the
Company that the execution of this Agreement by Executive and Executive's
employment by the Company and the performance of Executive's duties hereunder
will not violate or be a breach of any agreement with a former employer, client
or any other person or entity. Further, Executive agrees to indemnify the
Company for any claim, including, but not limited to, attorneys' fees and

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expenses of investigation, by any such third party that such third party may now
have or may hereafter come to have against the Company based upon or arising out
of any non-competition agreement, invention or secrecy agreement between
Executive and such third party which was in existence as of the date of this
Agreement.

         10. Assignment; Binding Effect. Executive understands that Executive
has been selected for employment by the Company on the basis of Executive's
personal qualifications, experience and skills. Executive agrees, therefore,
that Executive cannot assign all or any portion of Executive's performance under
this Agreement. Executive, Executive's spouse and the estates of each shall not
have any right to encumber or dispose of any right to receive payments
hereunder, it being understood that such payments and the right thereto are
nonassignable and nontransferable; provided, however in the event of the death
of Executive, any payments that Executive is entitled to receive may be assigned
to the beneficiaries of Executive's estate. Subject to the preceding three (3)
sentences and the express provisions of Section 11 below, this Agreement shall
be binding upon, inure to the benefit of and be enforceable by the parties
hereto and their respective heirs, legal representatives, successors and
assigns.

         11. Complete Agreement. Executive has no oral representations,
understandings or agreements with the Company or any of its officers, directors
or representatives covering the same subject matter as this Agreement. This
Agreement is the final, complete and exclusive statement and expression of the
agreement between the Company and Executive and of all the terms of this
Agreement, and it cannot be varied, contradicted or supplemented by evidence of
any prior or contemporaneous oral or written agreements.

         12. Amendment; Waiver. This Agreement may not be modified except in
writing signed by the parties, and no term of this Agreement may be waived
except by a writing signed by the party waiving the benefit of such terms. No
waiver by the parties hereto of any default or breach of any term, condition or
covenant of this Agreement shall be deemed to be a waiver of any subsequent
default or breach of the same or any other term, condition or covenant contained
herein.

         13. Notice. Whenever any notice is required hereunder, it shall be
given in writing addressed as follows:

         To the Company:          Comfort Systems USA, Inc.
                                  Three Riverway, Suite 200
                                  Houston, TX 77056
                                  Attention: General Counsel

         To Executive:            David Lanphar
                                  99 N. Post Oak Lane #7203
                                  Houston, TX 77024

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Notice shall be deemed given and effective on the earlier of five (5) days after
the deposit in the U.S. mail of a writing addressed as above and sent first
class mail, certified, return receipt requested, or when actually received.
Either party may change the address for notice by notifying the other party of
such change in accordance with this Section 13.

         14. Severability; Enforceability. If any portion of this Agreement is
held invalid or inoperative, the other portions of this Agreement shall be
deemed valid and operative and, so far as is reasonable and possible, effect
shall be given to the intent manifested by the portion held invalid or
inoperative. Moreover, in the event any court of competent jurisdiction shall
determine that the scope, time or territorial restrictions set forth in any
covenant contained herein are unreasonable, then it is the intention of the
parties that such restrictions be enforced to the fullest extent which the court
deems reasonable, and this Agreement shall thereby be reformed. Each of the
covenants contained in this Agreement shall be construed as an agreement
independent of any other provision in this Agreement, and the existence of any
claim or cause of action of Executive against the Company, whether predicated on
this Agreement or otherwise, shall not constitute a defense to the enforcement
by the Company of such covenants.

         15. Survival. The provisions and covenants of Sections 3, 4, 6, 7 and 8
shall survive termination of this Agreement.

         16. Specific Performance. Because of the difficulty of measuring
economic losses to the Company as a result of a breach of the covenants
contained in Sections 3, 4, 6, 7 and 8 and because of the immediate and
irreparable damage that could be caused to the Company for which it would have
no other adequate remedy, Executive agrees that the Company shall be entitled to
specific performance and that such covenants may be enforced by the Company in
the event of any breach or threatened breach by Executive, by injunctions,
restraining orders and other appropriate equitable relief. Executive further
agrees to waive any requirement for the securing or posting of any bond in
excess of $50,000 in connection with the obtaining of any such injunctive or any
other equitable relief.

         17. Arbitration. With the exception of Sections 4 and 8, any unresolved
dispute or controversy arising under or in connection with this Agreement shall
be settled exclusively by arbitration, conducted by a single arbitrator in
Houston, Texas, in accordance with the National Rules for the Resolution of
Employment Disputes of the American Arbitration Association ("AAA") then in
effect, provided that the parties may agree to use arbitrators other than those
provided by the AAA. The arbitrators shall not have the authority to add to,
detract from, or modify any provision hereof nor to award punitive damages to
any injured party. The arbitrators shall have the authority to order back pay,
severance compensation, reimbursement of costs, including those incurred to
enforce this Agreement, and interest thereon. A decision by the arbitrator shall
be final and binding. Judgment may be entered on the arbitrator's award in any
court having jurisdiction. Responsibility for bearing the cost of the
arbitration shall be determined by the arbitrator and shall be proportional to
the arbitrator's decision on the merits.

         18. Attorney's Fees. If any litigation is instituted to enforce or
interpret the provisions of this Agreement or the transactions described herein,
the prevailing party in such action shall be

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entitled to recover such party's reasonable attorneys' fees and other costs from
the other party hereto.

         19. Governing Law. This Agreement shall be governed by and construed in
accordance with the internal laws of the State of Texas.

         20. Counterparts. This Agreement may be executed in multiple
counterparts, each of which shall be deemed to be an original and all of which
together shall constitute one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

EXECUTIVE:                             COMPANY:

                                       COMFORT SYSTEMS USA, INC.

/s/ David Lanphar                      /s/ William Murdy
-----------------                      -----------------
David Lanphar                          William Murdy
                                       President

                                       8<PAGE>

                                                                    EXHIBIT 10.2

                                     WAIVER

         This Waiver dated as of May 10, 2002 ("Waiver") is among Comfort
Systems USA, Inc., a Delaware corporation (the "Company"), the Subsidiaries of
the Company listed on the signature pages hereto as Guarantors, the banks and
other financial institutions listed on the signature pages attached hereto (the
"Banks"), BANK ONE, N.A., individually as a Bank ("BOT") and as Administrative
Agent for the other Banks (in such capacity, the "Administrative Agent"),
BANKERS TRUST COMPANY, individually as a Bank and as Syndication Agent for the
other Banks, BANK OF AMERICA, N.A., individually as a Bank and as Documentation
Agent for the other Banks, CREDIT LYONNAIS NEW YORK BRANCH, individually as a
Bank and as Co-agent, NATIONAL CITY BANK, individually as a Bank and as
Co-Agent, and THE BANK OF NOVA SCOTIA, individually as a Bank and as Co-Agent.
Capitalized terms not defined herein shall have the meaning assigned to such
terms in the Credit Agreement.

                                  INTRODUCTION

         A. The Company, the Guarantors, the Administrative Agent, the Co-Agents
and the Banks are parties to that certain Fourth Amended and Restated Credit
Agreement dated as of March 22, 2001 as amended by that certain First Amendment
thereto dated as of February 8, 2002 (the "Credit Agreement").

         B. Section 8.15 of the Credit Agreement requires the Company's EBITDA
for the fiscal quarter ending March 31, 2002 to equal or exceed the amount of
$3,332,850.00. The Company has informed the Administrative Agent, Co-Agents and
the Banks that its EBITDA for such fiscal quarter will not equal or exceed such
amount; accordingly, there has occurred an Event of Default under Section 8.15
of the Credit Agreement.

         C. The Company has requested a one time waiver of the Event of Default
described in paragraph B above.

         D. The Administrative Agent, Co-Agents and the Banks are agreeable to
such requests upon the terms and conditions herein stated.

         THEREFORE, the Company, the Guarantors, the Administrative Agent, the
Co-Agents and the Banks hereby agree as follows:

     1.  The Banks hereby waive the Event of Default arising under Section 8.15
of the Credit Agreement solely by virtue of the Company's failure to achieve
EBITDA for the fiscal quarter ending March 31, 2002 of at least $3,332,850.00.

     2.  This Waiver shall be effective as of March 31, 2002 when the
Administrative Agent shall have received duly executed counterparts hereof
signed by the Company, the Guarantor and the Majority Banks (or, in the case of
any party as to which an executed counterpart shall not have been received, the
Administrative Agent shall have received telegraphic, telex or other written
confirmation from such party of execution of a counterpart hereof by such
party).

                                       -1-
<PAGE>

     3.  This Waiver is limited solely to the purposes and to the extent
provided herein and shall have no applicability to any obligation of the Company
except those described in Section 8.15 of the Credit Agreement which relate
solely to the fiscal quarter ending March 31, 2002. This Waiver shall not be
construed to be a waiver, except as specifically provided in paragraph 1 of this
Waiver, (i) of any term, condition or provision of the Credit Agreement or (ii)
of any Event of Default or Default that has or may have occurred or occurs other
than as specified in paragraph 1. Except as specifically provided herein, the
Credit Agreement will continue in full force and effect.

     4.  This Waiver (i) shall be binding on the parties hereto and their
respective successors and assigns and shall inure to the benefit of the parties
hereto and their respective successors and assigns, (ii) may not be amended,
terminated or otherwise modified except by written consent of each party hereof,
(iii) may be executed in multiple counterparts, each of which shall be deemed an
original, but all of which together shall constitute one and the same instrument
and (iv) constitutes the entire agreement among the parties hereto with respect
to the matters addressed herein.

     5.  Choice of Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS, EXCEPT TO THE EXTENT THAT THE
LAWS OF THE UNITED STATES OF AMERICA AND ANY RULES, REGULATIONS OR ORDERS ISSUED
OR PROMULGATED THEREUNDER APPLICABLE TO THE AFFAIRS AND TRANSACTIONS OF THE
BANKS OTHERWISE PREEMPT TEXAS LAW, IN WHICH EVENT SUCH FEDERAL LAW SHALL
CONTROL.

     6.  Final Agreement of the Parties. THIS AGREEMENT, THE CREDIT AGREEMENT AS
AMENDED HEREBY AND THE OTHER LOAN DOCUMENTS CONSTITUTE A "LOAN AGREEMENT" AS
DEFINED IN SECTION 26.02(A) OF THE TEXAS BUSINESS AND COMMERCE CODE, AND
REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.
THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

                                       -2-

<PAGE>

         EXECUTED effective as of May 10, 2002.

                                          COMPANY:

                                          COMFORT SYSTEMS USA, INC.

                                          By: /s/ William George
                                             -----------------------------------
                                                  William George
                                                  Senior Vice President

         By their execution of this Waiver below, the Guarantors acknowledge and
agree that their respective Guaranteed Obligations under the Credit Agreement
remain in full force and effect, unchanged by this Waiver.

                                       -3-
<PAGE>
                                GUARANTORS:

                                ACI MECHANICAL, INC.
                                ACCU-TEMP GP, INC.
                                ACCU-TEMP LP, INC.
                                ACCU-TEMP, LLC, by Accu-Temp LP, Inc.,
                                managing member
                                AIR SOLUTIONS USA, INC.
                                ARC COMFORT SYSTEMS USA, INC.
                                (fka  American Refrigeration Contractors, Inc.)
                                BATCHELOR'S MECHANICAL CONTRACTORS, INC.
                                BCM CONTROLS CORPORATION
                                CARSON BROTHERS, INC.
                                CEL, INC. (Casey Electric)
                                CENTRAL MECHANICAL, INC.
                                COMFORT SYSTEMS USA G.P., INC.
                                COMFORT SYSTEMS USA (ARKANSAS), INC.
                                (fka River City Mechanical, Incorporated)
                                COMFORT SYSTEMS USA (BRISTOL), INC.
                                (fka Fred Hayes Mechanical Contractors, Inc.)
                                COMFORT SYSTEMS USA (CLEVELAND), INC.
                                (fka Tech Heating and Air Conditioning, Inc.)
                                COMFORT SYSTEMS USA (HARTFORD), INC.
                                (fka The Harvey Robbin Company)
                                COMFORT SYSTEMS USA (INTERMOUNTAIN), INC.
                                (fka Contract Service, Inc.)
                                COMFORT SYSTEMS USA (OREGON), INC.
                                (fka A.C.I. Mechanical USA, Inc.)
                                COMFORT SYSTEMS USA (PHILADELPHIA), INC.
                                (fka Lower Bucks Cooling and
                                Heating Corporation)
                                COMFORT SYSTEMS USA (SOUTH BOSTON), INC.
                                (fka Climate Control, Inc.)
                                COMFORT SYSTEMS USA (SYRACUSE), INC.
                                (fka Armani Plumbing & Mechanical, Inc.)
                                COMFORT SYSTEMS USA (TEXAS), L.P., by
                                Comfort Systems USA G.P., Inc.,
                                sole general partner
                                COMFORT SYSTEMS USA (TWIN CITIES), INC.
                                (fka EDS, Inc.)
                                COMFORT SYSTEMS USA (WESTERN MICHIGAN), Inc.
                                (restructure River City Mechanical,
                                Inc. and H&H Plumbing & Heating, Inc.)

                                      -4-
<PAGE>
                                DESIGN MECHANICAL INCORPORATED
                                EASTERN HEATING & COOLING, INC.
                                EASTERN REFRIGERATION CO., INC.
                                ESS ENGINEERING, INC.
                                GULFSIDE MECHANICAL, INC.
                                H & M MECHANICAL, INC.
                                HELM CORPORATION
                                HELM CORPORATION SAN DIEGO
                                HESS MECHANICAL CORPORATION
                                INDUSTRIAL COOLING INC.
                                J & J MECHANICAL, INC.
                                JAMES AIR CONDITIONING ENTERPRISE INC.
                                MARTIN HEATING, INC.
                                MECHANICAL SERVICE GROUP, INC. (Page)
                                MJ MECHANICAL SERVICES, INC.
                                NEEL MECHANICAL CONTRACTORS, INC.
                                NORTH AMERICAN MECHANICAL, INC.
                                OK SHEET METAL AND AIR CONDITIONING, INC.
                                PLANT SERVICES INCORPORATED
                                QUALITY AIR HEATING & COOLING, INC.
                                ROSS & ASSOCIATES, INC.
                                S&K AIR CONDITIONING CO., INC.
                                S.I. GOLDMAN COMPANY, INC.
                                S.M. LAWRENCE COMPANY, INC.
                                SA ASSOCIATES, INC. (formerly
                                Salmon & Alder, Inc.)
                                SALMON & ALDER, LLC, by
                                SA Associates, Inc., sole member
                                SEASONAIR, INC.
                                SOUTHERN BLUEGRASS MECHANICAL, INC.
                                STANDARD HEATING & AIR CONDITIONING COMPANY
                                SUPERIOR MECHANICAL SYSTEMS
                                TARGET CONSTRUCTION, INC.
                                TEMP-RIGHT SERVICE, INC.
                                THE CAPITAL REFRIGERATION COMPANY
                                TRI-CITY MECHANICAL, INC.
                                TROOST SERVICE CO.
                                WEATHER ENGINEERING, INC.
                                WESTERN BUILDING SERVICES, INC.

                                By: /s/ William George
                                   --------------------------
                                     William George
                                     Vice President

                                      -5-
<PAGE>

                                ATLAS-ACCURATE HOLDINGS, L.L.C.
                                ATLAS-ACCURATE HOLDINGS, L.L.C., as
                                the  sole general partner of
                                Accurate Air Systems, L.P.
                                (restructure of Accurate Air Systems, Inc.)
                                Atlas Air Conditioning Company, L.P.
                                (restructure of Atlas Air Conditioning Company
                                and Atlas Comfort Services USA, Inc.)
                                Mechanical Technical, L.P.
                                United Environmental Services, L.P.
                                (restructure of United Environmental
                                Services, Inc./UES Conversion Corporation)

                                By:  COMFORT SYSTEMS USA, INC.,
                                          sole member

                                By: /s/ William George
                                   --------------------------
                                     William George
                                     Vice President

                                      -6-

<PAGE>
                                        ADMINISTRATIVE AGENT/BANK:

                                        BANK ONE, NA,
                                        as Administrative Agent and Individually
                                        as a Bank

                                        By: /s/ John A. Horst
                                           ----------------------------
                                        Name:  John Horst
                                        Title: Director

                                      -7-
<PAGE>

                                        SYNDICATION AGENT/BANK:

                                        BANKERS TRUST COMPANY,
                                        as Syndication Agent and Individually
                                        as a Bank

                                        By: /s/ Alexander Bici
                                           -----------------------------
                                        Name:  Alexander Bici
                                        Title: Vice President

                                      -8-

<PAGE>

                                        DOCUMENTATION AGENT/BANK:

                                        BANK OF AMERICA, N.A. (formerly known
                                        as NationsBank, N.A.), as Documentation
                                        Agent and Individually, as a Bank

                                        By: /s/ Michael W. Colon
                                           -----------------------------
                                        Name:  Michael W. Colon
                                        Title: Principal

                                      -9-

<PAGE>
                                        CO-AGENT/BANK:

                                        CREDIT LYONNAIS NEW YORK BRANCH,
                                        as Co-Agent and Individually as a Bank

                                        By: /s/ Attila Koc
                                        Name:  Attila Koc
                                           -----------------------------
                                        Title: Senior Vice President

                                      -10-

<PAGE>
                                        CO-AGENT/BANK:

                                        NATIONAL CITY BANK,
                                        as Co-Agent and Individually, as a Bank

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

                                      -11-

<PAGE>

                                        CO-AGENT/BANK:

                                        THE BANK OF NOVA SCOTIA,
                                        as Co-Agent and Individually, as a Bank

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

                                      -12-

<PAGE>
                                        BANK:

                                        UNION BANK OF CALIFORNIA, N.A.

                                        By: /s/ J. Scott Jessup
                                           -----------------------------
                                        Name:  J. Scott Jessup
                                        Title: Vice President

                                      -13-

<PAGE>

                                        BANK:

                                        COMERICA BANK

                                        By: /s/ William S. Rogers
                                           -----------------------------
                                        Name:  William S. Rogers
                                        Title: Vice President

                                      -14-

<PAGE>
                                        BANK:

                                        BANK POLSKA, KASA OPIEKI S.A., PEKOA
                                        S.A. GROUP, New York Branch

                                        By: /s/ Barry W. Henry
                                           -----------------------------
                                        Name:  Barry W. Henry
                                        Title: Vice President

                                      -15-

<PAGE>
                                        BANK:

                                        FIRSTAR BANK, NATIONAL ASSOCIATION

                                        By: /s/ William J. Hronek
                                           -----------------------------
                                        Name:  William J. Hronek
                                        Title: Senior Vice President

                                      -16-

<PAGE>
                                        BANK:

                                        LASALLE BANK NATIONAL ASSOCIATION

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

                                      -17-

<PAGE>

                                        BANK:

                                        GENERAL ELECTRIC CAPITAL
                                        CORPORATION

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

                                      -18-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00041-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00041-of-00352.parquet"}]]