Ugh, 6 months later and after tearing out the entire keg box, the condensation returns. I’m not seeing mold anywhere (yet), but there was a huge puddle, probably 8-12 oz of water in the back of the fridge. When I reinsulated, I used 2 layers of 2″ foil-backed insulation, plus another layer of 1″ insulation for a total R-value of 23 on the floorboards, then plywood, then aluminum sheet. I also added 1″ insulation to the ceiling and walls. sealed everything up with Great-Stuff foam so I feel it’s really tight.
The only difference for my project is that I have two mini-fridge doors that I use as access. They still have the rubber door gaskets on them, and they seal against rubber foam weather stripping that I installed, and close with window latches that pull the doors really tight. When the doors are closed and latched, there is zero light getting through…but what are the chances that humid air is getting in somehow? Its the only thing I can think of.
The cooling coils get droplets of ice on them, but no frost builds up. And I have the compressor/condensor outside the fridge and controlled by an external digital thermostat controller. If there is a defrost cycle on my fridge, how would I know and how can I disable it?
