New fridges, particularly frost-free ones, make a combination of noises that some people may find annoying. More noise is produced when the compressor starts up and also during the defrost cycle. Some models have an external fan system to help keep the compressor cool, which can add to the noise level. Also, plastics inside the fridge can make loud noises as they expand and contract with temperature changes. The design of your kitchen and the fridge's location will affect what you'll hear. Our test tells you which models are noisier during normal running, but some of these more unusual noises can be more noticeable with models that are quieter during normal running.