Dryers use a lot of residential electricity so Mr. Green of the Sierra Club addressed this question.
The most energy efficient way to dry your clothes is to use the energy from the sun and hang your clothes to dry. For those that want to use a dryer, there are now Energy Star-certified models that use 20 percent less energy than the older models. Mr. Green also includes tips for using any dryer more efficiently including:
1. Do full loads but don’t overload.
2. Dry 2 or more loads in a row to take advantage of the dryer’s retained heat
3. Use lower heat for a longer time, instead of higher heat for a shorter time.
4. Separate clothes and dry similar kinds together. (Lightweight synthetics dry much faster than bath towels and natural-fiber clothes.)
For a complete list of Mr. Green’s tips as well as a list of the Energy Star-certified dryers, click here