Dehumidifiers are classified depending on several important factors. A unit that has the best of these factors can be said to be the most reliable dehumidifier. For instance, a good dehumidifier obviously has to be able to remove a large amount of moisture from the air in a day. Apart from that, the unit should also work quietly and use less energy—read about energy efficient dehumidifiers here. The most reliable unit should also be able to operate independent of you getting involved every now and then. That means the dehumidifier should come with an auto-restart function so that it can restart in case of a power outage. Also check for the auto-defrost feature which enables the compressors and filters to keep working even in low temperatures. Also, find a unit that gives you value for money. Read about the Frigidaire FAD704DWD review here—it’s the best seller and most reviewed on Amazon.