best isolation for dwc. (no water chiller)

so i had big problem with temps. they were going in mid 80s all the time and frozen bottle helped for maybe 2hours st a time.
solution is simple just go to hardware store and buy some floor insulation panel in my case finfoam 50mm (finnish brand) and build a box out of it. then you can put your regular dwc inside the box and drill a hole for the plant on top of your "cooler" so the plant can come thru and allso to extrat some hot air from the box.
insulates heat really well now i use frozen bottle 2 times a day and only for 15 minutes max and have no issues with heat. this cost me around 20 usd maximum.
 

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