EXHIBIT 10.17 TO 10-K

                                                           EXECUTION COUNTERPART

                              EMPLOYMENT AGREEMENT

      THIS EMPLOYMENT AGREEMENT (the "Agreement") between Shambaugh & Son, Inc.,
an Indiana corporation (the "Company") and a wholly-owned subsidiary of Comfort
Systems USA, Inc., a Delaware corporation ("Comfort"), and Mark Shambaugh
("Executive") is entered into and effective as of the 15th day of November,
1998. 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, Comfort and the other
subsidiaries and affiliates of each (collectively, the "Comfort Group") are
engaged primarily in the business of mechanical contracting services, including
heating, ventilation and air conditioning, plumbing, piping and electrical and
related services ("Services").

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

      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.

            (1) The Company hereby employs Executive as its Chief Executive
      Officer and Executive hereby accepts this employment upon the terms and
      conditions herein contained. Executive agrees to devote substantially all
      of his business time, attention and efforts to promote and further the
      business of the Company.

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

            (3) 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 duties and responsibilities hereunder;
      PROVIDED, HOWEVER, that Executive may engage in the activities listed on
      Exhibit A hereto so long as Executive does not devote more time to such
      activities than Executive has historically devoted to such activities. 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.

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

            (1) BASE SALARY. Effective the date hereof, the base salary payable
      to Executive shall be $300,000 per year, payable on a regular basis in
      accordance with the Company's standard payroll procedures, but not less
      often than monthly. On at least an annual basis, the Company will review
      Executive's performance and may make increases to such base salary if, in
      its discretion, any such increase is warranted.

            (2) 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:

                  (1) 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.

                  (2) 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.

                  (3) In addition to the benefits described in Section 2(b)(i),
            Executive shall be entitled to continue to participate in such other
            benefit programs, including, but not limited to, auto allowance and
            401(k) plan, as shall be granted from time to time by the Company to
            its key employees in a manner consistent with its past practice.

                  (4) Executive may, in his discretion, take up to eight weeks
            of vacation time during any calendar year; PROVIDED, HOWEVER, that
            in no event shall Executive take more than three consecutive weeks
            of vacation time; and PROVIDED, FURTHER, that in no event shall
            Executive's vacation time accrue from year to year.

      3. CONFIDENTIALITY.

            (1) CONFIDENTIAL INFORMATION. As used herein, the term "Confidential
      Information" means any information, technical data or know-how of the
      Company and the other members of the Comfort Group, 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 and pricing, prospects of the Comfort Group,
      and any information, technical data or know-how that contain or reflect
      any of the foregoing, whether prepared by the Company, any other member of
      the Comfort Group, Executive or any other person or entity; PROVIDED,
      HOWEVER, that the term "Confidential Information" shall not include
      information, technical data or know-how which is generally available to
      the public not as a result of any breach of this Agreement by Executive.

            (2) NO DISCLOSURE. Except in the performance of Executive's duties
      as an executive of the Company, Executive will not, during or after the
      Executive's engagement with the Company, disclose to any person or entity
      or use, for any reason whatsoever, any Confidential Information, unless
      such disclosure is required by law or the order of any governmental
      authority under color of law; PROVIDED, HOWEVER, that prior to disclosing
      any information pursuant to this Section 3(b), Executive shall, if
      possible, give prior written notice of the disclosure of such information
      to the Company and shall provide the Company with the opportunity to
      contest such disclosure.

      4. NON-COMPETITION AGREEMENT.

            (1) COMPETITION. Executive will not, during the period of
      Executive's employment by or with the Company, and for a period of two
      years 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:

                  (1) except for the activities listed on Exhibit A hereto,
            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 or any
            other member of the Comfort Group anywhere within the United States
            or Canada (the "Territory");

                  (2) call upon any person who is, at that time, within the
            Territory, an employee of the Company or any other member of the
            Comfort Group 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 or such other member of the Comfort
            Group;

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

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

      Notwithstanding the above, the foregoing covenant shall not be deemed to
      prohibit Executive from acquiring as an investment not more than 1% of any
      class of securities of a competing business whose securities are traded on
      a national securities exchange or on an over-the-counter or similar
      market.

            (2) 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 five years (the "Term"), unless
terminated sooner as herein provided. This Agreement and Executive's employment
may be terminated in any one of the following ways:

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

            (2) 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 consecutive months, then
      30 days after receiving written notice (which notice may occur before or
      after the end of such four-month period, but which shall not be effective
      earlier than the last day of such four-month period), the Company may
      terminate Executive's employment hereunder, provided Executive is unable
      to resume his 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 or one 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.

            (3) CAUSE. The Company may terminate this Agreement 10 days after
      written notice to Executive for cause, which shall be any of the
      following: (i) Executive's willful or material breach of this Agreement,
      which breach is not cured within 10 days after written notice by the
      Company to Executive; (ii) Executive's gross negligence in the performance
      of any of Executive's material duties and responsibilities hereunder,
      which gross negligence is not cured within 10 days after written notice by
      the Company to Executive; (iii) Executive's intentional nonperformance of
      any of Executive's material duties and responsibilities hereunder, which
      nonperformance is not cured within 10 days after written notice by the
      Company to Executive; (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. In the
      event of a termination for cause, as enumerated above, Executive shall
      have no right to any severance compensation.

            (4) 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 30 days after receipt of
      written notice. Should Executive be terminated by the Company without
      cause during the first three years of the Term (the "Initial Term"),
      Executive shall receive from the Company Executive's base salary at the
      rate then in effect for the greater of the time period remaining under the
      Initial Term or for one year, and such amount shall be payable in a
      lump-sum payment due on the effective date of termination. Should
      Executive be terminated by the Company without cause during the final two
      years of the Term, Executive shall receive from the Company Executive's
      base salary at the rate then in effect for one year, and such amount shall
      be payable during such period in a manner consistent with the Company's
      standard pay practices. If Executive resigns or otherwise terminates
      Executive's employment, Executive shall receive no severance compensation.

      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 or any other member of the Comfort
Group, by any customer of the Company or any other member of the Comfort Group
(including, but not limited to, any such customers obtained by Executive), by
any acquisition candidate of the Company or any other member of the Comfort
Group, and all records compiled by Executive which pertain to the business or
activities of the Company or any other member of the Comfort Group 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 other member of the Comfort Group or any representative of any of them
shall be delivered promptly to the Company without request by it upon
termination of Executive's employment 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 with the Company or within one year thereafter, and which are
directly related to the business or activities of the Company or which Executive
conceives as a result of his 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 or any other member
of the Comfort Group's relationships or agreements with significant vendors or
customers or any other significant and material trade secret of the Company or
any other member of the Comfort Group, 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
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 estate 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, that 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 sentences
and the express provisions of Section 11, 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 a
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 term.

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

      To the Company:         Shambaugh & Son, Inc.
                              7614 Opportunity Drive
                              Ft. Wayne, IN 46801
                              Attention: President

      with a copy to:         Comfort Systems USA, Inc.
                              777 Post Oak Boulevard, Suite 500
                               Houston, TX 77056
                              Attention:  General Counsel

      To Executive:           Mark Shambaugh
                              2233 East Cedar Canyons Road
                              Ft. Wayne, IN  46845

Notice shall be deemed given and effective on the earlier of five 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 of Sections 3, 4, 6, 7 and 8 shall survive
the 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 connection with the
obtaining of any such injunctive or 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 the
State of Indiana, 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 an arbitrator other than
those provided by the AAA. The arbitrator 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 arbitrator 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 a 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. ATTORNEYS' 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 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 Indiana.

      20. COUNTERPARTS. This Agreement may be executed in multiple counterparts,
each of which shall be deemed 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.

                                    COMPANY:

                                    SHAMBAUGH & SON, INC.


                                    By: /s/ 
                                        William George, Vice President


                                   EXECUTIVE:

                                   /s/
                                   Mark Shambaugh