All dryers spin clothes around and blow hot air on them. How to select a dryer depends on your needs. The details are what drive the choice of a machine:

• Energy source: Whether you choose a gas dryer or an electric one will be based largely on what kind of hookup is available at the new dryer's location. Gas appliances usually cost slightly more initially, but tend to be more energy- efficient. A leading consumer affairs magazine estimates that a gas dryer costs 30 cents less per load to operate.
• Capacity: Since manufacturers define capacity differently, one "extra large" dryer might not be the same as another.When choosing what dryer to buy, compare capacity using the cubic foot measurement. If your space is limited, stackable washer-dryer units are available.
• Coordinate the capacity of your dryer with that of your washer. You'll defeat the purpose of increased efficiency if you have a super-sized dryer but a washer that can only supply a half-capacity load (or vice-versa). The general rule is to have about twice as much capacity in the dryer than in the washer. So if you buy a 3.3 or 3.5 cu. ft. washer, you will need a 7 cu. ft. dryer. (You need more dryer space because the clothes need room to flop around.)
• When in doubt, err on the side of larger when choosing a dryer. More dryer capacity will allow the clothes to dry more quickly, which saves money on your energy bill and is better for the environment. Like most large appliances today, a dryer will last for years. Plan for the future and consider possible changes in your family size when buying a dryer.
• Digital controls replace knobs on high-end dryers.
  Controls: As with washers, controls on dryers have become more sophisticated, yet easier to use. Digital displays and one-touch selection can be programmed and preset to meet your drying needs. For a simpler operation, choose dial or push-button controls.
• Temperature settings: Different fabrics require different drying times and temperatures. Your clothes will look newer longer, plus have fewer wrinkles, if they are dried using the correct settings. At a minimum, most machines offer "cotton" and "permanent press" settings, with "more dry" and "less dry" options. Choose a dryer withsettings that meet your needs.
• Noise level: Choose a quiet machine if your dryer will be in or near a living area. Some newer models have additional insulation and reinforced frames to reduce operating noise.