A single-door fridge only has a single door, contrary to a fridge freezer combination. A single-door fridge still often has a small freezer compartment at the top of the fridge. This freezer compartment is a lot smaller than the freezer compartment of a fridge freezer combination. Choose a single-door fridge with freezer compartment if you need extra fridge space, but also want to freeze a couple of popsicles.