<PAGE>

                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549

                                  -----------

                                   FORM S-8

                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

                                ACR Group, Inc.
                                ---------------
            (Exact Name of Registrant as Specified in Its Charter)

                                     Texas
                                     -----
        (State or Other Jurisdiction of Incorporation or Organization)

                                  74-2008473
                                  ----------
                     (I.R.S. Employer Identification No.)

                3200 Wilcrest, Suite 440, Houston, Texas 77042
               ------------------------------------------------
              (Address of Principal Executive Offices) (Zip Code)

                             ACR Group 401(k) Plan
                             ---------------------
                           (Full Title of the Plan)

      A. Stephen Trevino, 3200 Wilcrest, Suite 440, Houston, Texas 77042
      ------------------------------------------------------------------
                    (Name and Address of Agent For Service)

                                (713) 780-8532
                                --------------
         (Telephone Number, Including Area Code, of Agent For Service)

                        CALCULATION OF REGISTRATION FEE
==============================================================================

                                    Proposed        Proposed
    Title of          Amount         Maximum         Maximum     Amount of
   Securities          to be         Offering       Aggregate   Registration
     to be        Registered (1)    Price Per       Offering        Fee
   Registered                       Share (2)       Price (2)
------------------------------------------------------------------------------

 Common Stock,
 $.01 per share      1,000,000        $ 0.75        $ 750,000       $  258
   par value          shares
("Common Stock")
==============================================================================

(1)  In addition, pursuant to Rule 416(c) under the Securities Act of 1933, this
     registration statement also covers an indeterminate amount of interests to
     be offered or sold pursuant to the employee benefit plan described herein.

(2)  Pursuant to Rule 457(h), the registration fee is calculated on the basis of
     the average of the high and low reported sales prices on the NASDAQ Small-
     Cap Market on December 6, 2000.
<PAGE>

                                    PART I
             Information Required in the Section 10(a) Prospectus

Item 1.   Plan Information.

Item 2.   Registration Information and Employee Plan Annual Information.

       Information required by Part I of Form S-8 to be contained in a
prospectus meeting the requirements of Section 10(a) of the Securities Act of
1933 is omitted from this registration statement in accordance with Rule 428
under the Securities Act of 1933 and the Note to Part I of Form S-8.

                                    PART II
              Information Required in the Registration Statement

Item 3.     Incorporation of Documents by Reference.

       The following documents, which have been filed with the Commission by ACR
Group, Inc. (the "Company" or the "registrant"), are incorporated herein by
reference and made a part hereof:

       (a)  The Company's Annual Report on Form 10-K for the fiscal year ended
            February 29, 2000;

       (b)  The Company's Quarterly Report on Form 10-Q for the quarters ended
            May 31, 2000 and August 31, 2000.

       (c)  The description of the Common Stock of the Company contained in its
            registration statement on Form 8-A, Commission File No. 0-12490.

       All documents filed by the Company pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Securities Exchange Act of 1934 subsequent to the date hereof
and prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then
remaining unsold shall be deemed to be incorporated by reference herein and to
be part hereof from the date of the filing of such documents.

Item 4.     Description of Securities.

       Not applicable.

Item 5.     Interests of Named Experts and Counsel.

       Not applicable.

                                       2
<PAGE>

Item 6.        Indemnification of Directors and Officers.

       Article 2.02-1 of the Texas Business Corporation Act contains detailed
provisions for indemnification of directors and officers of Texas corporations
against any judgments, penalties, fines, settlements and reasonable expenses
which may be incurred in connection with any threatened, pending or completed
proceeding in which the director or officer is a named defendant or respondent.
The Company's Bylaws, as amended and restated, require the Company to indemnify
and advance expenses to the Company's directors and officers to the maximum
extent allowed by the Texas Business Corporation Act and expressly authorize the
Company to purchase directors and officers liability insurance.

       The Articles of Incorporation of the Company, as amended and restated
(the "Articles"), expressly provide that no director of the Company shall be
personally liable to the Company or its shareholders for monetary damage for an
act or omission in the director's capacity as a director, except to the extent
otherwise expressly provided for by a statute of the State of Texas. The
Articles obligate the Company to indemnify its officers and directors against
any and all judgments, penalties (including excise and similar taxes), fines,
settlements and reasonable expenses incurred by that person to the full extent
permitted under Texas law.

       Texas law also permits a corporation to purchase and maintain insurance
or another arrangement on behalf of any person who is or was a director or
officer against any liability asserted against him and incurred by him in such a
capacity or arising out of his status as such a person, whether or not the
corporation would have the power to indemnify him against that liability under
Article 2.02-1.

       The above discussion of Article 2.02-1 of the Texas Business Corporation
Act and of the Company's Articles of Incorporation and Bylaws is not intended to
be exhaustive and is respectively qualified in its entirety by such statute and
Bylaws.

Item 7.        Exemption from Registration Claimed.

       Not applicable.

Item 8.        Exhibits.

       4.1     Specimen Common Stock Certificate. Incorporated by reference to
               Exhibit 4.1 to the Company's Annual Report on Form 10-K for the
               fiscal year ended February 28, 1993.

       5.1*    Opinion of Robert D. Remy, legal counsel to the Company.

       5.2     The Company undertakes to submit the Plan and any amendment
               thereto to the Internal Revenue Service ("IRS") in a timely
               manner and has made or will make all changes required by the IRS
               in order to qualify the Plan.

                                       3
<PAGE>

         23.1*    Consent of Ernst & Young LLP, Independent Auditors.

         23.2     Consent of Robert D. Remy (contained in the opinion filed as
                  Exhibit 5.1).

----------------------
     *  Filed herewith.


Item 9.           Undertakings.

         (a)      The undersigned registrant hereby undertakes:

                  (1)   To file, during any period in which offers or sales are
         being made, a post-effective amendment to this registration statement:

                        (i)    to include any prospectus required by Section
                               10(a)(3) of the Securities Act of 1933;

                        (ii)   to reflect in the prospectus any facts or events
                               arising after the effective date of the
                               registration statement (or the most recent post-
                               effective amendment thereof) which, individually
                               or in the aggregate, represent a fundamental
                               change in the information set forth in this
                               registration statement; and

                        (iii)  to include any material information which respect
                               to the plan of distribution not previously
                               disclosed in this registration statement or any
                               material change to such information in this
                               registration statement;

         provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
         apply if the information required to be included in a post-effective
         amendment by those paragraphs is contained in periodic reports filed by
         the registrant pursuant to Section 13 or Section 15(d) of the
         Securities and Exchange Act of 1934 that are incorporated by reference
         in the registration statement.

                  (2) That, for the purpose of determining any liability under
         the Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof.

                  (3) To remove from registration by means of a post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering.

                                       4
<PAGE>

         (b)   The undersigned registrant hereby undertakes that, for purposes
         of determining any liability under the Securities Act of 1933, each
         filing of the registrant's annual report pursuant to Section 13(a) or
         15(d) of the Securities Exchange Act of 1934 (and, where applicable,
         each filing of an employee benefit plan's annual report pursuant to
         Section 15(d) of the Securities Exchange Act of 1934) that is
         incorporated by reference in the registration statement shall be deemed
         to be a new registration statement relating to the securities offered
         therein, and the offering of such securities at that time shall be
         deemed to be the initial bona fide offering thereof.

         (h)   Insofar as indemnification for liabilities arising under the
         Securities Act of 1933 may be permitted to directors, officers and
         controlling persons of the registrant pursuant to the foregoing
         provisions, or otherwise, the registrant has been advised that in the
         opinion of the Securities and Exchange Commission such indemnification
         is against public policy as expressed in the Act and is, therefore,
         unenforceable. In the event that a claim for indemnification against
         such liabilities (other than the payment by the registrant of expenses
         incurred or paid by a director, officer or controlling person of the
         registrant in the successful defense of any action, suit or proceeding)
         is asserted by such director, officer or controlling person in
         connection with the securities being registered, the registrant will,
         unless in the opinion of its counsel the matter has been settled by
         controlling precedent, submit to a court of appropriate jurisdiction
         the question whether such indemnification by it is against public
         policy as expressed in the Act and will be governed by the final
         adjudication of such issue.

                                       5
<PAGE>

                                  SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the city of Houston, State of Texas, on this 7th day of December,
2000.

                                                     ACR GROUP, INC.



                                                     By:  ALEX TREVINO, JR.
                                                         (Alex Trevino, Jr.,
                                                          President)

          Pursuant to the requirement of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.

     Signatures                      Title                         Date
     ----------                      -----                         ----

 ALEX TREVINO, JR.          Chairman of the Board              December 7, 2000
 (Alex Trevino, Jr.)        of Directors, President and
                            Chief Executive Officer
                            (Principal executive officer)

 ANTHONY R. MARESCA         Director, Senior Vice President,   December 7, 2000
 (Anthony R. Maresca)       Chief Financial Officer and
                            Treasurer (Principal financial
                            and accounting officer)


 A. STEPHEN TREVINO         Director                           December 7, 2000
 (A. Stephen Trevino)


 RONALD T. NIXON            Director                           December 7, 2000
 (Ronald T. Nixon)


 ROLAND H. ST. CYR          Director                           December 7, 2000
 (Roland St. Cyr)

                                       6
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{"company-data": {"conformed-name": "ACR GROUP INC", "cik": "0000711307", "assigned-sic": "5070", "irs-number": "742008473", "state-of-incorporation": "TX", "fiscal-year-end": "0228"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-51546", "film-number": "786100"}, "business-address": {"street1": "3200 WILCREST DR", "street2": "STE 440", "city": "HOUSTON", "state": "TX", "zip": "77042", "phone": "7137808532"}, "mail-address": {"street1": "3200 WILCREST DR", "street2": "STE 440", "city": "HOUSTON", "state": "TX", "zip": "77042"}, "former-company": {"former-conformed-name": "TIME ENERGY SYSTEMS INC", "date-changed": "19920703"}}
SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549

                                  -----------

                                   FORM S-8

                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

                                ACR Group, Inc.
                                ---------------
            (Exact Name of Registrant as Specified in Its Charter)

                                     Texas
                                     -----
        (State or Other Jurisdiction of Incorporation or Organization)

                                  74-2008473
                                  ----------
                     (I.R.S. Employer Identification No.)

                3200 Wilcrest, Suite 440, Houston, Texas 77042
               ------------------------------------------------
              (Address of Principal Executive Offices) (Zip Code)

                             ACR Group 401(k) Plan
                             ---------------------
                           (Full Title of the Plan)

      A. Stephen Trevino, 3200 Wilcrest, Suite 440, Houston, Texas 77042
      ------------------------------------------------------------------
                    (Name and Address of Agent For Service)

                                (713) 780-8532
                                --------------
         (Telephone Number, Including Area Code, of Agent For Service)

                        CALCULATION OF REGISTRATION FEE
==============================================================================

                                    Proposed        Proposed
    Title of          Amount         Maximum         Maximum     Amount of
   Securities          to be         Offering       Aggregate   Registration
     to be        Registered (1)    Price Per       Offering        Fee
   Registered                       Share (2)       Price (2)
------------------------------------------------------------------------------

 Common Stock,
 $.01 per share      1,000,000        $ 0.75        $ 750,000       $  258
   par value          shares
("Common Stock")
==============================================================================

(1)  In addition, pursuant to Rule 416(c) under the Securities Act of 1933, this
     registration statement also covers an indeterminate amount of interests to
     be offered or sold pursuant to the employee benefit plan described herein.

(2)  Pursuant to Rule 457(h), the registration fee is calculated on the basis of
     the average of the high and low reported sales prices on the NASDAQ Small-
     Cap Market on December 6, 2000.
PART I
             Information Required in the Section 10(a) Prospectus

Item 1.   Plan Information.

Item 2.   Registration Information and Employee Plan Annual Information.

       Information required by Part I of Form S-8 to be contained in a
prospectus meeting the requirements of Section 10(a) of the Securities Act of
1933 is omitted from this registration statement in accordance with Rule 428
under the Securities Act of 1933 and the Note to Part I of Form S-8.

                                    PART II
              Information Required in the Registration Statement

Item 3.     Incorporation of Documents by Reference.

       The following documents, which have been filed with the Commission by ACR
Group, Inc. (the "Company" or the "registrant"), are incorporated herein by
reference and made a part hereof:

       (a)  The Company's Annual Report on Form 10-K for the fiscal year ended
            February 29, 2000;

       (b)  The Company's Quarterly Report on Form 10-Q for the quarters ended
            May 31, 2000 and August 31, 2000.

       (c)  The description of the Common Stock of the Company contained in its
            registration statement on Form 8-A, Commission File No. 0-12490.

       All documents filed by the Company pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Securities Exchange Act of 1934 subsequent to the date hereof
and prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then
remaining unsold shall be deemed to be incorporated by reference herein and to
be part hereof from the date of the filing of such documents.

Item 4.     Description of Securities.

       Not applicable.

Item 5.     Interests of Named Experts and Counsel.

       Not applicable.

                                       2
Item 6.        Indemnification of Directors and Officers.

       Article 2.02-1 of the Texas Business Corporation Act contains detailed
provisions for indemnification of directors and officers of Texas corporations
against any judgments, penalties, fines, settlements and reasonable expenses
which may be incurred in connection with any threatened, pending or completed
proceeding in which the director or officer is a named defendant or respondent.
The Company's Bylaws, as amended and restated, require the Company to indemnify
and advance expenses to the Company's directors and officers to the maximum
extent allowed by the Texas Business Corporation Act and expressly authorize the
Company to purchase directors and officers liability insurance.

       The Articles of Incorporation of the Company, as amended and restated
(the "Articles"), expressly provide that no director of the Company shall be
personally liable to the Company or its shareholders for monetary damage for an
act or omission in the director's capacity as a director, except to the extent
otherwise expressly provided for by a statute of the State of Texas. The
Articles obligate the Company to indemnify its officers and directors against
any and all judgments, penalties (including excise and similar taxes), fines,
settlements and reasonable expenses incurred by that person to the full extent
permitted under Texas law.

       Texas law also permits a corporation to purchase and maintain insurance
or another arrangement on behalf of any person who is or was a director or
officer against any liability asserted against him and incurred by him in such a
capacity or arising out of his status as such a person, whether or not the
corporation would have the power to indemnify him against that liability under
Article 2.02-1.

       The above discussion of Article 2.02-1 of the Texas Business Corporation
Act and of the Company's Articles of Incorporation and Bylaws is not intended to
be exhaustive and is respectively qualified in its entirety by such statute and
Bylaws.

Item 7.        Exemption from Registration Claimed.

       Not applicable.

Item 8.        Exhibits.

       4.1     Specimen Common Stock Certificate. Incorporated by reference to
               Exhibit 4.1 to the Company's Annual Report on Form 10-K for the
               fiscal year ended February 28, 1993.

       5.1*    Opinion of Robert D. Remy, legal counsel to the Company.

       5.2     The Company undertakes to submit the Plan and any amendment
               thereto to the Internal Revenue Service ("IRS") in a timely
               manner and has made or will make all changes required by the IRS
               in order to qualify the Plan.

                                       3
23.1*    Consent of Ernst & Young LLP, Independent Auditors.

         23.2     Consent of Robert D. Remy (contained in the opinion filed as
                  Exhibit 5.1).

----------------------
     *  Filed herewith.

Item 9.           Undertakings.

         (a)      The undersigned registrant hereby undertakes:

                  (1)   To file, during any period in which offers or sales are
         being made, a post-effective amendment to this registration statement:

                        (i)    to include any prospectus required by Section
                               10(a)(3) of the Securities Act of 1933;

                        (ii)   to reflect in the prospectus any facts or events
                               arising after the effective date of the
                               registration statement (or the most recent post-
                               effective amendment thereof) which, individually
                               or in the aggregate, represent a fundamental
                               change in the information set forth in this
                               registration statement; and

                        (iii)  to include any material information which respect
                               to the plan of distribution not previously
                               disclosed in this registration statement or any
                               material change to such information in this
                               registration statement;

         provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
         apply if the information required to be included in a post-effective
         amendment by those paragraphs is contained in periodic reports filed by
         the registrant pursuant to Section 13 or Section 15(d) of the
         Securities and Exchange Act of 1934 that are incorporated by reference
         in the registration statement.

                  (2) That, for the purpose of determining any liability under
         the Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof.

                  (3) To remove from registration by means of a post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering.

                                       4
(b)   The undersigned registrant hereby undertakes that, for purposes
         of determining any liability under the Securities Act of 1933, each
         filing of the registrant's annual report pursuant to Section 13(a) or
         15(d) of the Securities Exchange Act of 1934 (and, where applicable,
         each filing of an employee benefit plan's annual report pursuant to
         Section 15(d) of the Securities Exchange Act of 1934) that is
         incorporated by reference in the registration statement shall be deemed
         to be a new registration statement relating to the securities offered
         therein, and the offering of such securities at that time shall be
         deemed to be the initial bona fide offering thereof.

         (h)   Insofar as indemnification for liabilities arising under the
         Securities Act of 1933 may be permitted to directors, officers and
         controlling persons of the registrant pursuant to the foregoing
         provisions, or otherwise, the registrant has been advised that in the
         opinion of the Securities and Exchange Commission such indemnification
         is against public policy as expressed in the Act and is, therefore,
         unenforceable. In the event that a claim for indemnification against
         such liabilities (other than the payment by the registrant of expenses
         incurred or paid by a director, officer or controlling person of the
         registrant in the successful defense of any action, suit or proceeding)
         is asserted by such director, officer or controlling person in
         connection with the securities being registered, the registrant will,
         unless in the opinion of its counsel the matter has been settled by
         controlling precedent, submit to a court of appropriate jurisdiction
         the question whether such indemnification by it is against public
         policy as expressed in the Act and will be governed by the final
         adjudication of such issue.

                                       5
SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the city of Houston, State of Texas, on this 7th day of December,
2000.

                                                     ACR GROUP, INC.

                                                     By:  ALEX TREVINO, JR.
                                                         (Alex Trevino, Jr.,
                                                          President)

          Pursuant to the requirement of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.

     Signatures                      Title                         Date
     ----------                      -----                         ----

 ALEX TREVINO, JR.          Chairman of the Board              December 7, 2000
 (Alex Trevino, Jr.)        of Directors, President and
                            Chief Executive Officer
                            (Principal executive officer)

 ANTHONY R. MARESCA         Director, Senior Vice President,   December 7, 2000
 (Anthony R. Maresca)       Chief Financial Officer and
                            Treasurer (Principal financial
                            and accounting officer)

 A. STEPHEN TREVINO         Director                           December 7, 2000
 (A. Stephen Trevino)

 RONALD T. NIXON            Director                           December 7, 2000
 (Ronald T. Nixon)

 ROLAND H. ST. CYR          Director                           December 7, 2000
 (Roland St. Cyr)

                                       6