I recently swapped my converted Frigidaire mini fridge for a Danby 5.2. I fully insulated my tower and added a tower chiller, which works really good for the tower. The fan box sits on the back shelf and the hose stops directly under the faucet elbow stems. I left plenty of room for cold air to drop back down.
I used the same thermometer set up from the Frigidaire - which always worked pretty good. Using a wired thermometer, I set a thermometer probe in a bottle of water on the floor of the fridge and ran the wire to the display outside the fridge. I then set a digital refrigerator thermometer at the top of the fridge. In the beginning, the top thermometer ran about 3-4 degrees higher than the one at the bottom (38 bottom, 41 top) - as expected. Now, suddenly, it's keeping a 7-8 degree difference, (37 bottom, 44 top). The fridge is inside the house. There has been a recent weather change here to dramatically higher temps and higher humidity outside, and slightly so inside due the weather.
I haven't put a keg in the new fridge yet, I was letting it run for a couple weeks so that everything gets stabilized temp-wise and normal. I was supposed to hook up the first keg tomorrow.
1. What would cause this change in the temp differential?
2. Should I add another fan to circulate air inside or could there be a bigger problem?