Once you've established installation and type, you can decide on capacity. If this will be your main refrigerator, size this appliance to meet your family's needs. Buying an overly large refrigerator which may remain partially empty will only use more kitchen space and increase purchase and energy costs. If you're buying a spare or beverage refrigerator, a compact model under 300L may be sufficient. A 400L size can be adequate for a family of 4, but a 510 – 620L or higher would be better for a large family. Check out our tips on how to choose a refrigerator .