EXHIBIT 10.19

                                 PROMISSORY NOTE
$7,500.00                                                            May 6, 1998


FOR VALUE RECEIVED,  Natural Cool, Inc., a Vermont corporation,  promises to pay
to Chase  Refrigeration,  or order,  the  principal  sum of Seven  Thousand Five
Hundred  Dollars  ($7,500.00),  without  interest.  The said principal  shall be
payable  to the holder  hereof at the rate of Six  Hundred  Twenty-five  Dollars
($625.00)  per month,  and  continuing  monthly  until  paid in full.  Provided,
however,  that in the event that any one  payment is more than  thirty (30) days
late, then interest shall accrue on the unpaid balance thereafter at the rate of
twelve percent (12%) per annum.

Each such installment shall be applied to the reductio of principal.

If default is made in the payment of any  installment  of principal and interest
in this note, the entire unpaid principal  balance and accrued interest shall at
once  become due and  payable  without  notice,  and the holder of this note may
place the same in the hands of any attorney for collection,  and, in such event,
in  addition  to  the  unpaid  principal  balance  and  accrued  interest,   the
undersigned  promises and agrees to pay all costs and charges of suit, including
reasonable attorney fees. Failure to exercise this option shall not constitute a
waiver of the right to exercise the same in the event of any subsequent default.

All parties to this note,  whether  principal,  surety,  guarantor,  endorser or
accommodation  maker hereby waive  presentment  for  payment,  demand,  protest,
notice of protest and notice of dishonor, and agree that the receipt of interest
in advance or the  extension of time shall not  relinquish or di a ge a ndorser,
surety, accommodation maker, or guarantor of this note.

                                   NATURAL COOL, INC.

                                   By: /s/ Richard J. Fricke
                                   ---------------------------------------------
                                   Richard J. Fricke,  Duly Authorized Agent of
                                   Natural Cool, Inc.

In consideration of the loan evidenced by the within note made at the request of
the undersigned,  on the terms and conditions thereof, the undersigned guarantee
the prompt payment of the note and each installment, when due, whether at stated
maturity,  acceleration,  or  otherwise,  and in  accordance  with all terms and
conditions of the note and [portion  obliterated in original] and conditions and
affirm the waivers and consents [portion obliterated in original].

The liability of the  undersigned  under this guarantee  shall be direct and not
conditional or contingent upon the pursuit of any remedies  against any maker or
endorser,  or against any  collateral  held as  security  for the payment of the
note.
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Notice of acceptance is waived. This shall be a continuing guarantee,  extending
to any notes given in  extension or renewal of this note,  notwithstanding  that
the  original  may  have  been  surrendered,   provided  the  liability  of  the
undersigned  shall not be  increased  over the amount  contained in the original
note plus accrued and unpaid interest, together with such other fees and amounts
as may be provided for in the within note.

Dated at Derby, Vermont, this 6 day of May, 1998.

                                        SAFE ALTERNAT IVES CORPORATION
                                        OF AMERICA, INC.

                                        By: /s/ Richard J. Fricke
                                        ----------------------------------------
                                        Richard J. Fricke, Duly Authorized Agent