Inkbird Dual Stage DV 12V Digital Temperature Controller Fahrenheit Thermostat Heating and Cooling for Homebrewing Brew Fermenter Fridge Incubator Greenhouse

Before you do any of the things i did, maybe buy some thermometers (https://www.amazon.com/dp/B097HF322L) to check whether the fridge is getting cold enough or not. Here are my tips: Add 1-2" of polystyrene insulation to the fridge body (whichever fits), I bought a hot knife (https://www.harborfreight.com/130-watt-hot-knife-70931.html) to cut it and it saved so much time and made no mess 1000% recommend. I bought this fridge fan (https://www.amazon.com/Beech-Lane-Connection-Batteries-Recirculates/dp/B0B7SCYGK7), you can splice it into the fridge light or just drill a hole out the back and run the wire through there. My fridge has a small freezer and that is where the cold comes from, so i pointed the fan at that so it can blow the cold air to the rest of the fridge. I've been having a problem with my fridge since I bought it (TruckFridge 130), it has always struggled to stay cool so I bought this thermometer (https://www.amazon.com/Inkbird-Temperature-Controller-Fahrenheit-Thermostat/dp/B019I3YCFS) to replace the one it came with; it works so much better My fridge has a compressor with a 120mm fan sucking hot air away; I replaced it with a more powerful one, then added an extra fan so that it blows on the compressor to create a wind-tunnel like thing.