Refrigerators

What's more energy efficient, a refrigerator with a top-mounted freezer, bottom-mounted freezer, or a side-by-side?
My refrigerator is very old, but still works fine. Is it worth it to replace it?
Where can I find a list of ENERGY STAR certified French door refrigerators?
What is the difference between automatic and manual defrost? If I have a refrigerator that I need to manually defrost, how do I do it, and how often is it needed?
Should I unplug my refrigerator to save energy if I am going to be away?
The list of ENERGY STAR certified refrigerators shows a column with the heading "adjusted volume." What does that term mean?
Can a wine refrigerator, kegerator, or residential beverage chiller earn the ENERGY STAR?
Can I put a refrigerator in an uninsulated garage which is subject to winter and summer extreme temperatures?
Is it more efficient to have a through-the-door ice dispenser or to not have one and open the freezer door to get ice?
Are mini fridges labeled as ENERGY STAR?
Are manual defrost refrigerators more energy efficient?