example powered by an external power source of conventional design so as to be an energy parasitic system proximate the end of acoustic enclosure 16 opposite the end in which ventilating air is introduced into the interior of enclosure 16 outlet opening 70 is formed into the top wall of enclosure 16 a ventilation exhaust duct or stack 72 is in air flow communication with the interior of enclosure 16 via outlet opening 70 air forced through ventilation intake duct 42 and the interior of enclosure 16 passes through exhaust duct 72 to atmosphere as shown exhaust duct 72 includes a flue portion 74 equipped with a heat exchanger 76 heat exchanger 76 which may configured similarly to heat exchanger 46 and include multiple spaced fluidly interconnected tube sections arranged transversely to the air flowing through the exhaust duct serves to draw heat off of the ventilating air in order to power absorption refrigeration unit 90 that supplies chillant to heat exchanger 46 in particular the high temperatures experienced by turbine 10 which may reach up to between about 2000 u00b0 f and 3500 u00b0 f results in high temperature ventilation exhaust gases flowing through duct 72 ventilation exhaust gases typically expelled from enclosure 16 through duct 72 have temperatures ranging from 200 u00b0 f to 700 u00b0 f heat exchanger 76 is connected with absorption refrigeration system 90 via thermally insulated conduits 81 and 82 that route high temperature water or steam.