....WITH _ANY CONSTRUCTION_ THERE SHOULD BE AN AIR TO AIR HEAT EXCHANGER.....THE MORE A UNITE IS SEALED UP THE MORE THE UNITE NEEDS TO "BE HEALTHY" AND WE ARE TALKING AN AIR TO AIR EXCHANGER...."DON'T LEAVE HOME WITHOUT ONE"...OR LEAVE A WINDOW OPEN AT NITE WHEN SLEEPING-HEATING AND COOLING THE OUTSIDE WORLD BUT VENTING MOISTURE AND CONTAMINATES... MOST OF THE USED UNITES HAVE MOLD AND CAUSE ALLERGIC ISSUES IN A LOT OF PEOPLE....SOME TO THE EXTENT THAT DESTRUCTION IS THE ONLY SOLUTION TO THE ISSUE SPECIALLY ON THE SOUTH......GEOFKAYE AND THE RIVERCITY GIRLZ....
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