Invest in a couple of Really Useful 64litre boxes which are vermin proof and fairly waterproof, then put them in a cold garage or shed. Use the fridge for things like meat, but butter, cheese etc are not going to come to any harm if they are a bit warmer. This Christmas our fridge thermostat isn't working perfectly, long story. I'm using a gas/electric coolbox which I bought ages ago for my son to use in his shepherd's hut at steam rallies, and an electric coolbox we bought from Halfords years ago. they are sat on the floor of my larger than average kitchen, but could easily be used in a shed or spare room or garage.